diff --git a/src/graphics/presentation/systemOverlay.cpp b/src/graphics/presentation/systemOverlay.cpp
index e3ceca842..56ed70617 100644
--- a/src/graphics/presentation/systemOverlay.cpp
+++ b/src/graphics/presentation/systemOverlay.cpp
@@ -29,9 +29,9 @@ namespace Libs::Graphics {
 
 namespace {
 
-namespace CoreIme   = Libs::Ime;
-namespace DialogIme = Libs::Dialog::ImeDialog;
-namespace ErrorDialog = Libs::Dialog::ErrorDialog;
+namespace CoreIme      = Libs::Ime;
+namespace DialogIme    = Libs::Dialog::ImeDialog;
+namespace SystemDialog = Libs::Dialog::SystemDialog;
 
 namespace Ime {
 
@@ -104,7 +104,7 @@ bool HostQueueExternalInput(uint64_t generation, ExternalInput input) {
 
 } // namespace Ime
 
-enum class OverlayKind : uint8_t { None, Ime, Error };
+enum class OverlayKind : uint8_t { None, Ime, Dialog };
 
 struct OverlaySession {
 	OverlayKind kind       = OverlayKind::None;
@@ -114,14 +114,14 @@ struct OverlaySession {
 };
 
 struct OverlaySnapshot {
-	OverlaySession            session;
-	Ime::HostSnapshot         ime;
-	ErrorDialog::HostSnapshot error;
+	OverlaySession             session;
+	Ime::HostSnapshot          ime;
+	SystemDialog::HostSnapshot dialog;
 };
 
 bool GetOverlaySnapshot(OverlaySnapshot* snapshot) {
-	if (ErrorDialog::GetHostSnapshot(&snapshot->error)) {
-		snapshot->session = {OverlayKind::Error, snapshot->error.generation};
+	if (SystemDialog::GetHostSnapshot(&snapshot->dialog)) {
+		snapshot->session = {OverlayKind::Dialog, snapshot->dialog.generation};
 		return true;
 	}
 	if (Ime::GetHostSnapshot(&snapshot->ime)) {
@@ -234,7 +234,7 @@ void RefreshVisibility() {
 	bool capture_keyboard   = false;
 	bool text_input         = false;
 	bool multiline          = false;
-	if (snapshot.session.kind == OverlayKind::Error) {
+	if (snapshot.session.kind == OverlayKind::Dialog) {
 		capture_controller = true;
 		capture_keyboard   = true;
 	} else if (snapshot.session.kind == OverlayKind::Ime) {
@@ -429,14 +429,14 @@ void InitializeSystemOverlayInput(SDL_Window* window) {
 	}
 	CoreIme::SetVisibilityCallback(OnCoreVisibilityChanged);
 	DialogIme::SetVisibilityCallback(OnDialogVisibilityChanged);
-	ErrorDialog::SetVisibilityCallback(RefreshVisibility);
+	SystemDialog::SetVisibilityCallback(RefreshVisibility);
 	RefreshVisibility();
 }
 
 void ShutdownSystemOverlayInput() {
 	CoreIme::SetVisibilityCallback(nullptr);
 	DialogIme::SetVisibilityCallback(nullptr);
-	ErrorDialog::SetVisibilityCallback(nullptr);
+	SystemDialog::SetVisibilityCallback(nullptr);
 	{
 		std::scoped_lock lock(g_visibility_mutex);
 		g_input_lifecycle_active = false;
@@ -466,9 +466,9 @@ void ShutdownSystemOverlayInput() {
 SystemOverlayVisualState GetSystemOverlayVisualState() noexcept {
 	const auto core   = CoreIme::GetVisualState();
 	const auto dialog = DialogIme::GetVisualState();
-	const auto error  = ErrorDialog::GetVisualState();
-	return {core.active || dialog.active || error.active,
-	        core.revision + dialog.revision + error.revision};
+	const auto system = SystemDialog::GetVisualState();
+	return {core.active || dialog.active || system.active,
+	        core.revision + dialog.revision + system.revision};
 }
 
 bool ProcessSystemOverlayInput(const SDL_Event& event) {
@@ -521,10 +521,11 @@ bool ProcessSystemOverlayInput(const SDL_Event& event) {
 	if (keyboard_event && !g_input_keyboard) {
 		return false;
 	}
-	if (keyboard_event && session.kind == OverlayKind::Error) {
+	if (keyboard_event && session.kind == OverlayKind::Dialog) {
 		if (event.type == SDL_EVENT_KEY_DOWN && !event.key.repeat &&
-		    (event.key.key == SDLK_RETURN || event.key.key == SDLK_KP_ENTER)) {
-			ErrorDialog::HostAccept(generation);
+		    (event.key.key == SDLK_RETURN || event.key.key == SDLK_KP_ENTER ||
+		     event.key.key == SDLK_ESCAPE)) {
+			SystemDialog::HostClose(generation);
 		}
 		return true;
 	}
@@ -904,7 +905,7 @@ struct SystemOverlay::Impl {
 		ImGui::End();
 	}
 
-	void DrawError(const ErrorDialog::HostSnapshot& snapshot, vk::Extent2D extent) {
+	void DrawDialog(const SystemDialog::HostSnapshot& snapshot, vk::Extent2D extent) {
 		const ImVec2 display(static_cast<float>(extent.width), static_cast<float>(extent.height));
 		const float  scale = std::max(std::min(display.x / 1280.0f, display.y / 720.0f), 0.5f);
 		ImGui::GetBackgroundDrawList()->AddRectFilled({0.0f, 0.0f}, display,
@@ -922,17 +923,23 @@ struct SystemOverlay::Impl {
 		constexpr ImGuiWindowFlags flags = ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_NoMove |
 		                                   ImGuiWindowFlags_NoSavedSettings |
 		                                   ImGuiWindowFlags_AlwaysAutoResize;
-		ImGui::Begin("##SystemError", nullptr, flags);
-		ImGui::TextUnformatted("Error");
+		const bool                 signin = snapshot.kind == SystemDialog::Kind::Signin;
+		ImGui::Begin("##SystemDialog", nullptr, flags);
+		ImGui::TextUnformatted(signin ? "Sign in to PlayStation Network" : "Error");
 		ImGui::Separator();
 		const auto error_code = static_cast<uint32_t>(snapshot.error_code);
-		ImGui::TextWrapped("%s", error_code == 0x80550006u
+		ImGui::TextWrapped("%s", signin ? "PlayStation Network sign-in is unavailable."
+		                         : error_code == 0x80550006u
 		                             ? "You are not signed in to PlayStation Network."
 		                             : "An error has occurred.");
-		ImGui::TextDisabled("Error code: 0x%08X", error_code);
+		if (!signin) {
+			ImGui::TextDisabled("Error code: 0x%08X", error_code);
+		}
 		const float button_width = std::min(140.0f * scale, ImGui::GetContentRegionAvail().x);
 		ImGui::SetCursorPosX((ImGui::GetWindowSize().x - button_width) * 0.5f);
-		const bool accepted = ImGui::Button("OK", {button_width, 44.0f * scale});
+		const bool accepted =
+		    ImGui::Button(signin ? "Cancel" : "OK", {button_width, 44.0f * scale}) ||
+		    (signin && ImGui::IsKeyPressed(ImGuiKey_GamepadFaceRight, false));
 		if (focus_pending) {
 			ImGui::SetItemDefaultFocus();
 			focus_pending = false;
@@ -941,7 +948,7 @@ struct SystemOverlay::Impl {
 		ImGui::PopFont();
 		ImGui::PopStyleVar(2);
 		if (accepted) {
-			ErrorDialog::HostAccept(snapshot.generation);
+			SystemDialog::HostClose(snapshot.generation);
 		}
 	}
 
@@ -955,7 +962,8 @@ struct SystemOverlay::Impl {
 		if (session != snapshot.session) {
 			session       = snapshot.session;
 			focus_pending = true;
-			shift         = (snapshot.ime.option & Ime::OPTION_NO_AUTO_CAPITALIZE) == 0;
+			shift         = session.kind == OverlayKind::Ime &&
+			                (snapshot.ime.option & Ime::OPTION_NO_AUTO_CAPITALIZE) == 0;
 			symbol_mode   = false;
 			panel_offset  = {};
 			right_stick   = {};
@@ -981,8 +989,8 @@ struct SystemOverlay::Impl {
 			ImGui::EndFrame();
 			return false;
 		}
-		if (snapshot.session.kind == OverlayKind::Error) {
-			DrawError(snapshot.error, frame_extent);
+		if (snapshot.session.kind == OverlayKind::Dialog) {
+			DrawDialog(snapshot.dialog, frame_extent);
 		} else {
 			DrawIme(snapshot.ime, frame_extent);
 		}
diff --git a/src/libs/dialog.cpp b/src/libs/dialog.cpp
index cec494bf9..9173ebfa2 100644
--- a/src/libs/dialog.cpp
+++ b/src/libs/dialog.cpp
@@ -14,6 +14,81 @@
 // NOLINTNEXTLINE(modernize-concat-nested-namespaces)
 namespace Libs::Dialog {
 
+namespace {
+
+constexpr int DIALOG_STATUS_RUNNING  = 2;
+constexpr int DIALOG_STATUS_FINISHED = 3;
+
+struct DialogState {
+	int      status     = 0;
+	uint64_t generation = 0;
+};
+
+std::mutex  g_dialog_mutex;
+DialogState g_error;
+DialogState g_signin;
+uint64_t    g_dialog_generation        = 0;
+uint64_t    g_dialog_revision          = 0;
+int32_t     g_error_code               = 0;
+void (*g_dialog_visibility_callback)() = nullptr;
+
+void SetDialogStatus(DialogState& dialog, int status, std::unique_lock<std::mutex>& lock) {
+	const bool visibility_changed =
+	    (dialog.status == DIALOG_STATUS_RUNNING) != (status == DIALOG_STATUS_RUNNING);
+	dialog.status = status;
+	if (visibility_changed) {
+		g_dialog_revision++;
+		if (status == DIALOG_STATUS_RUNNING) {
+			dialog.generation = ++g_dialog_generation;
+		}
+	}
+	const auto callback = visibility_changed ? g_dialog_visibility_callback : nullptr;
+	lock.unlock();
+	if (callback != nullptr) {
+		callback();
+	}
+}
+
+} // namespace
+
+namespace SystemDialog {
+
+bool GetHostSnapshot(HostSnapshot* snapshot) {
+	std::scoped_lock lock(g_dialog_mutex);
+	if (g_signin.status == DIALOG_STATUS_RUNNING) {
+		*snapshot = {Kind::Signin, g_signin.generation, 0};
+		return true;
+	}
+	if (g_error.status == DIALOG_STATUS_RUNNING) {
+		*snapshot = {Kind::Error, g_error.generation, g_error_code};
+		return true;
+	}
+	return false;
+}
+
+VisualState GetVisualState() noexcept {
+	std::scoped_lock lock(g_dialog_mutex);
+	const bool       signin = g_signin.status == DIALOG_STATUS_RUNNING;
+	return {g_error.status == DIALOG_STATUS_RUNNING || signin, signin, g_dialog_revision};
+}
+
+void SetVisibilityCallback(void (*callback)()) {
+	std::scoped_lock lock(g_dialog_mutex);
+	g_dialog_visibility_callback = callback;
+}
+
+bool HostClose(uint64_t generation) {
+	std::unique_lock lock(g_dialog_mutex);
+	auto&            dialog = g_signin.status == DIALOG_STATUS_RUNNING ? g_signin : g_error;
+	if (dialog.status != DIALOG_STATUS_RUNNING || generation != dialog.generation) {
+		return false;
+	}
+	SetDialogStatus(dialog, DIALOG_STATUS_FINISHED, lock);
+	return true;
+}
+
+} // namespace SystemDialog
+
 namespace CommonDialog {
 
 LIB_NAME("CommonDialog", "CommonDialog");
@@ -207,6 +282,7 @@ constexpr int SIGNIN_ERROR_NOT_INITIALIZED     = static_cast<int>(0x81350001u);
 constexpr int SIGNIN_ERROR_ALREADY_INITIALIZED = static_cast<int>(0x81350002u);
 constexpr int SIGNIN_ERROR_PARAM_INVALID       = static_cast<int>(0x81350003u);
 constexpr int SIGNIN_ERROR_INVALID_STATE       = static_cast<int>(0x81350005u);
+constexpr int SIGNIN_ERROR_INVALID_USER_ID     = static_cast<int>(0x81350007u);
 
 struct SigninDialogResult {
 	int32_t result;
@@ -222,70 +298,78 @@ struct SigninDialogParam {
 static_assert(sizeof(SigninDialogResult) == 16);
 static_assert(sizeof(SigninDialogParam) == 16);
 
-static int g_signin_status = SIGNIN_STATUS_NONE;
-
 int KYTY_SYSV_ABI SigninDialogInitialize() {
 	PRINT_NAME();
-	if (g_signin_status != SIGNIN_STATUS_NONE) {
+	std::scoped_lock lock(g_dialog_mutex);
+	if (g_signin.status != SIGNIN_STATUS_NONE) {
 		return SIGNIN_ERROR_ALREADY_INITIALIZED;
 	}
-	g_signin_status = SIGNIN_STATUS_INITIALIZED;
+	g_signin.status = SIGNIN_STATUS_INITIALIZED;
 	return OK;
 }
 
 int KYTY_SYSV_ABI SigninDialogTerminate() {
 	PRINT_NAME();
-	if (g_signin_status == SIGNIN_STATUS_NONE) {
+	std::unique_lock lock(g_dialog_mutex);
+	if (g_signin.status == SIGNIN_STATUS_NONE) {
 		return SIGNIN_ERROR_NOT_INITIALIZED;
 	}
-	g_signin_status = SIGNIN_STATUS_NONE;
+	SetDialogStatus(g_signin, SIGNIN_STATUS_NONE, lock);
 	return OK;
 }
 
 int KYTY_SYSV_ABI SigninDialogOpen(const void* param) {
 	PRINT_NAME();
-	if (g_signin_status != SIGNIN_STATUS_INITIALIZED && g_signin_status != SIGNIN_STATUS_FINISHED) {
+	std::unique_lock lock(g_dialog_mutex);
+	if (g_signin.status == SIGNIN_STATUS_NONE) {
+		return SIGNIN_ERROR_NOT_INITIALIZED;
+	}
+	if (g_signin.status != SIGNIN_STATUS_INITIALIZED && g_signin.status != SIGNIN_STATUS_FINISHED) {
 		return SIGNIN_ERROR_INVALID_STATE;
 	}
-	if (param == nullptr ||
-	    static_cast<const SigninDialogParam*>(param)->size != sizeof(SigninDialogParam)) {
+	if (param == nullptr) {
 		return SIGNIN_ERROR_PARAM_INVALID;
 	}
-	g_signin_status = SIGNIN_STATUS_RUNNING;
+	const auto* p = static_cast<const SigninDialogParam*>(param);
+	if (p->size != sizeof(SigninDialogParam) || p->reserved[0] != 0 || p->reserved[1] != 0) {
+		return SIGNIN_ERROR_PARAM_INVALID;
+	}
+	if (p->user_id != Config::GetUserId()) {
+		return SIGNIN_ERROR_INVALID_USER_ID;
+	}
+	SetDialogStatus(g_signin, SIGNIN_STATUS_RUNNING, lock);
 	return OK;
 }
 
 int KYTY_SYSV_ABI SigninDialogClose() {
 	PRINT_NAME();
-	if (g_signin_status == SIGNIN_STATUS_NONE) {
+	std::unique_lock lock(g_dialog_mutex);
+	if (g_signin.status == SIGNIN_STATUS_NONE) {
 		return SIGNIN_ERROR_NOT_INITIALIZED;
 	}
-	if (g_signin_status != SIGNIN_STATUS_RUNNING && g_signin_status != SIGNIN_STATUS_FINISHED) {
-		return SIGNIN_ERROR_INVALID_STATE;
-	}
-	g_signin_status = SIGNIN_STATUS_FINISHED;
+	SetDialogStatus(g_signin, SIGNIN_STATUS_FINISHED, lock);
 	return OK;
 }
 
 int KYTY_SYSV_ABI SigninDialogUpdateStatus() {
 	PRINT_NAME();
-	if (g_signin_status == SIGNIN_STATUS_RUNNING) {
-		g_signin_status = SIGNIN_STATUS_FINISHED;
-	}
-	return g_signin_status;
+	std::scoped_lock lock(g_dialog_mutex);
+	return g_signin.status;
 }
 
 int KYTY_SYSV_ABI SigninDialogGetStatus() {
 	PRINT_NAME();
-	return g_signin_status;
+	std::scoped_lock lock(g_dialog_mutex);
+	return g_signin.status;
 }
 
 int KYTY_SYSV_ABI SigninDialogGetResult(void* result) {
 	PRINT_NAME();
-	if (g_signin_status == SIGNIN_STATUS_NONE) {
+	std::scoped_lock lock(g_dialog_mutex);
+	if (g_signin.status == SIGNIN_STATUS_NONE) {
 		return SIGNIN_ERROR_NOT_INITIALIZED;
 	}
-	if (g_signin_status != SIGNIN_STATUS_FINISHED) {
+	if (g_signin.status != SIGNIN_STATUS_FINISHED) {
 		return SIGNIN_ERROR_INVALID_STATE;
 	}
 	if (result == nullptr) {
@@ -661,64 +745,15 @@ struct ErrorDialogParam {
 
 static_assert(sizeof(ErrorDialogParam) == 16);
 
-static std::mutex g_error_mutex;
-static int        g_error_status     = STATUS_NONE;
-static uint64_t   g_error_generation = 0;
-static uint64_t   g_error_revision   = 0;
-static int32_t    g_error_code       = 0;
-static void (*g_error_visibility_callback)() = nullptr;
-
-static void SetStatus(int status, std::unique_lock<std::mutex>& lock) {
-	const bool visibility_changed =
-	    (g_error_status == STATUS_RUNNING) != (status == STATUS_RUNNING);
-	g_error_status = status;
-	if (visibility_changed) {
-		g_error_revision++;
-	}
-	const auto callback = visibility_changed ? g_error_visibility_callback : nullptr;
-	lock.unlock();
-	if (callback != nullptr) {
-		callback();
-	}
-}
-
-bool GetHostSnapshot(HostSnapshot* snapshot) {
-	std::scoped_lock lock(g_error_mutex);
-	if (g_error_status != STATUS_RUNNING) {
-		return false;
-	}
-	*snapshot = {g_error_generation, g_error_code};
-	return true;
-}
-
-VisualState GetVisualState() noexcept {
-	std::scoped_lock lock(g_error_mutex);
-	return {g_error_status == STATUS_RUNNING, g_error_revision};
-}
-
-void SetVisibilityCallback(void (*callback)()) {
-	std::scoped_lock lock(g_error_mutex);
-	g_error_visibility_callback = callback;
-}
-
-bool HostAccept(uint64_t generation) {
-	std::unique_lock lock(g_error_mutex);
-	if (g_error_status != STATUS_RUNNING || generation != g_error_generation) {
-		return false;
-	}
-	SetStatus(STATUS_FINISHED, lock);
-	return true;
-}
-
 int KYTY_SYSV_ABI ErrorDialogInitialize() {
 	PRINT_NAME();
 
-	std::scoped_lock lock(g_error_mutex);
-	if (g_error_status != STATUS_NONE) {
+	std::scoped_lock lock(g_dialog_mutex);
+	if (g_error.status != STATUS_NONE) {
 		return ERROR_ALREADY_INITIALIZED;
 	}
 
-	g_error_status = STATUS_INITIALIZED;
+	g_error.status = STATUS_INITIALIZED;
 
 	return OK;
 }
@@ -726,8 +761,8 @@ int KYTY_SYSV_ABI ErrorDialogInitialize() {
 int KYTY_SYSV_ABI ErrorDialogOpen(const void* param) {
 	PRINT_NAME();
 
-	std::unique_lock lock(g_error_mutex);
-	if (g_error_status != STATUS_INITIALIZED && g_error_status != STATUS_FINISHED) {
+	std::unique_lock lock(g_dialog_mutex);
+	if (g_error.status != STATUS_INITIALIZED && g_error.status != STATUS_FINISHED) {
 		return ERROR_INVALID_STATE;
 	}
 	if (param == nullptr) {
@@ -745,8 +780,7 @@ int KYTY_SYSV_ABI ErrorDialogOpen(const void* param) {
 	     p->size, static_cast<uint32_t>(p->error_code), p->user_id);
 
 	g_error_code = p->error_code;
-	g_error_generation++;
-	SetStatus(STATUS_RUNNING, lock);
+	SetDialogStatus(g_error, STATUS_RUNNING, lock);
 
 	return OK;
 }
@@ -754,12 +788,12 @@ int KYTY_SYSV_ABI ErrorDialogOpen(const void* param) {
 int KYTY_SYSV_ABI ErrorDialogClose() {
 	PRINT_NAME();
 
-	std::unique_lock lock(g_error_mutex);
-	if (g_error_status != STATUS_RUNNING) {
+	std::unique_lock lock(g_dialog_mutex);
+	if (g_error.status != STATUS_RUNNING) {
 		return ERROR_INVALID_STATE;
 	}
 
-	SetStatus(STATUS_FINISHED, lock);
+	SetDialogStatus(g_error, STATUS_FINISHED, lock);
 
 	return OK;
 }
@@ -767,12 +801,12 @@ int KYTY_SYSV_ABI ErrorDialogClose() {
 int KYTY_SYSV_ABI ErrorDialogTerminate() {
 	PRINT_NAME();
 
-	std::unique_lock lock(g_error_mutex);
-	if (g_error_status == STATUS_NONE) {
+	std::unique_lock lock(g_dialog_mutex);
+	if (g_error.status == STATUS_NONE) {
 		return ERROR_NOT_INITIALIZED;
 	}
 
-	SetStatus(STATUS_NONE, lock);
+	SetDialogStatus(g_error, STATUS_NONE, lock);
 
 	return OK;
 }
@@ -780,15 +814,15 @@ int KYTY_SYSV_ABI ErrorDialogTerminate() {
 int KYTY_SYSV_ABI ErrorDialogUpdateStatus() {
 	PRINT_NAME();
 
-	std::scoped_lock lock(g_error_mutex);
-	return g_error_status;
+	std::scoped_lock lock(g_dialog_mutex);
+	return g_error.status;
 }
 
 int KYTY_SYSV_ABI ErrorDialogGetStatus() {
 	PRINT_NAME();
 
-	std::scoped_lock lock(g_error_mutex);
-	return g_error_status;
+	std::scoped_lock lock(g_dialog_mutex);
+	return g_error.status;
 }
 
 } // namespace ErrorDialog
diff --git a/src/libs/dialog.h b/src/libs/dialog.h
index 2604f12a4..945ce22e7 100644
--- a/src/libs/dialog.h
+++ b/src/libs/dialog.h
@@ -68,22 +68,30 @@ int KYTY_SYSV_ABI MsgDialogProgressBarSetMsg(int target, const char* msg);
 
 } // namespace MsgDialog
 
-namespace ErrorDialog {
+namespace SystemDialog {
+
+enum class Kind { Error, Signin };
 
 struct HostSnapshot {
+	Kind     kind;
 	uint64_t generation;
 	int32_t  error_code;
 };
 
 struct VisualState {
 	bool     active;
+	bool     background;
 	uint64_t revision;
 };
 
 bool        GetHostSnapshot(HostSnapshot* snapshot);
 VisualState GetVisualState() noexcept;
 void        SetVisibilityCallback(void (*callback)());
-bool        HostAccept(uint64_t generation);
+bool        HostClose(uint64_t generation);
+
+} // namespace SystemDialog
+
+namespace ErrorDialog {
 
 int KYTY_SYSV_ABI ErrorDialogInitialize();
 int KYTY_SYSV_ABI ErrorDialogOpen(const void* param);
diff --git a/src/libs/libSystemService.cpp b/src/libs/libSystemService.cpp
index 8b04713e0..da4ffa296 100644
--- a/src/libs/libSystemService.cpp
+++ b/src/libs/libSystemService.cpp
@@ -163,8 +163,10 @@ static int KYTY_SYSV_ABI SystemServiceGetStatus(SystemServiceStatus* status) {
 		return SYSTEM_SERVICE_ERROR_PARAMETER;
 	}
 
-	*status                      = SystemServiceStatus();
-	status->is_system_ui_overlaid = Dialog::ErrorDialog::GetVisualState().active;
+	const auto dialog                  = Dialog::SystemDialog::GetVisualState();
+	*status                            = SystemServiceStatus();
+	status->is_system_ui_overlaid      = dialog.active;
+	status->is_in_background_execution = dialog.background;
 
 	return OK;
 }
diff --git a/tests/ShaderRecompilerComputeTests.cpp b/tests/ShaderRecompilerComputeTests.cpp
index 5de1d24ca..7d9512d79 100644
--- a/tests/ShaderRecompilerComputeTests.cpp
+++ b/tests/ShaderRecompilerComputeTests.cpp
@@ -977,6 +977,7 @@ void Require(const char *shader_name, const char *stage, bool value,
 
 void CheckErrorDialogLifecycle() {
   namespace ErrorDialog = Libs::Dialog::ErrorDialog;
+  namespace SystemDialog = Libs::Dialog::SystemDialog;
   struct Param {
     int32_t size = 16;
     int32_t error_code = static_cast<int32_t>(0x80550006u);
@@ -986,27 +987,27 @@ void CheckErrorDialogLifecycle() {
   static_assert(sizeof(Param) == 16);
   constexpr int invalid_state = static_cast<int>(0x80ed0005u);
   constexpr int invalid_param = static_cast<int>(0x80ed0003u);
-  static std::vector<ErrorDialog::VisualState> notifications;
+  static std::vector<SystemDialog::VisualState> notifications;
   notifications.clear();
-  ErrorDialog::SetVisibilityCallback([] {
-    const auto visual = ErrorDialog::GetVisualState();
-    ErrorDialog::HostSnapshot snapshot{};
+  SystemDialog::SetVisibilityCallback([] {
+    const auto visual = SystemDialog::GetVisualState();
+    SystemDialog::HostSnapshot snapshot{};
     Require("ErrorDialog", "callback reentry",
-            ErrorDialog::GetHostSnapshot(&snapshot) == visual.active &&
+            SystemDialog::GetHostSnapshot(&snapshot) == visual.active &&
                 (ErrorDialog::ErrorDialogGetStatus() == 2) == visual.active,
             "visibility callback observed inconsistent dialog state");
     notifications.push_back(visual);
   });
-  const auto initial_revision = ErrorDialog::GetVisualState().revision;
+  const auto initial_revision = SystemDialog::GetVisualState().revision;
   const auto check_state = [&](const char *stage, int status,
                                size_t visibility_changes) {
-    const auto visual = ErrorDialog::GetVisualState();
-    ErrorDialog::HostSnapshot snapshot{};
+    const auto visual = SystemDialog::GetVisualState();
+    SystemDialog::HostSnapshot snapshot{};
     Require("ErrorDialog", stage,
             ErrorDialog::ErrorDialogGetStatus() == status &&
                 ErrorDialog::ErrorDialogUpdateStatus() == status &&
-                visual.active == (status == 2) &&
-                ErrorDialog::GetHostSnapshot(&snapshot) == visual.active &&
+                visual.active == (status == 2) && !visual.background &&
+                SystemDialog::GetHostSnapshot(&snapshot) == visual.active &&
                 visual.revision == initial_revision + visibility_changes &&
                 notifications.size() == visibility_changes &&
                 (notifications.empty() ||
@@ -1036,9 +1037,9 @@ void CheckErrorDialogLifecycle() {
   check_state("failed open preserves initialized state", 1, 0);
   Require("ErrorDialog", "open", ErrorDialog::ErrorDialogOpen(&param) == 0,
           "valid error dialog did not open");
-  ErrorDialog::HostSnapshot first{};
+  SystemDialog::HostSnapshot first{};
   Require("ErrorDialog", "copied error code",
-          ErrorDialog::GetHostSnapshot(&first) &&
+          SystemDialog::GetHostSnapshot(&first) &&
               first.error_code == param.error_code,
           "host dialog did not expose the guest error code");
   param.error_code = static_cast<int32_t>(0x8055000au);
@@ -1048,31 +1049,31 @@ void CheckErrorDialogLifecycle() {
   Require(
       "ErrorDialog", "running failures",
       ErrorDialog::ErrorDialogOpen(&param) == invalid_state &&
-          !ErrorDialog::HostAccept(first.generation + 1),
+          !SystemDialog::HostClose(first.generation + 1),
       "an invalid open or stale acknowledgement replaced the active dialog");
-  ErrorDialog::HostSnapshot current{};
+  SystemDialog::HostSnapshot current{};
   Require("ErrorDialog", "failed open preserves active dialog",
-          ErrorDialog::GetHostSnapshot(&current) &&
+          SystemDialog::GetHostSnapshot(&current) &&
               current.generation == first.generation &&
               current.error_code == first.error_code,
           "active error code or generation changed after a failed open");
   check_state("failed operations preserve running state", 2, 1);
   Require("ErrorDialog", "acknowledge",
-          ErrorDialog::HostAccept(first.generation),
+          SystemDialog::HostClose(first.generation),
           "current host acknowledgement did not finish the dialog");
   check_state("acknowledged", 3, 2);
   Require("ErrorDialog", "finished operations",
-          !ErrorDialog::HostAccept(first.generation) &&
+          !SystemDialog::HostClose(first.generation) &&
               ErrorDialog::ErrorDialogClose() == invalid_state &&
               ErrorDialog::ErrorDialogOpen(&invalid) == invalid_param,
           "finished dialog accepted duplicate completion or an invalid open");
   check_state("failed operations preserve finished state", 3, 2);
   Require("ErrorDialog", "reopen and stale acknowledgement",
           ErrorDialog::ErrorDialogOpen(&param) == 0 &&
-              ErrorDialog::GetHostSnapshot(&current) &&
+              SystemDialog::GetHostSnapshot(&current) &&
               current.generation != first.generation &&
               current.error_code == param.error_code &&
-              !ErrorDialog::HostAccept(first.generation),
+              !SystemDialog::HostClose(first.generation),
           "reopened dialog accepted acknowledgement from its predecessor");
   check_state("reopened", 2, 3);
   Require("ErrorDialog", "guest close", ErrorDialog::ErrorDialogClose() == 0,
@@ -1080,15 +1081,15 @@ void CheckErrorDialogLifecycle() {
   check_state("closed", 3, 4);
   Require("ErrorDialog", "terminate running dialog",
           ErrorDialog::ErrorDialogOpen(&param) == 0 &&
-              ErrorDialog::GetHostSnapshot(&current) &&
+              SystemDialog::GetHostSnapshot(&current) &&
               ErrorDialog::ErrorDialogTerminate() == 0 &&
-              !ErrorDialog::HostAccept(current.generation),
+              !SystemDialog::HostClose(current.generation),
           "termination failed to remove the active dialog");
   check_state("terminated", 0, 6);
   Require("ErrorDialog", "reinitialize and stale acknowledgement",
           ErrorDialog::ErrorDialogInitialize() == 0 &&
               ErrorDialog::ErrorDialogOpen(&param) == 0 &&
-              !ErrorDialog::HostAccept(current.generation),
+              !SystemDialog::HostClose(current.generation),
           "reinitialization reused an old dialog generation");
   check_state("reinitialized", 2, 7);
   Require("ErrorDialog", "final termination",
@@ -1097,20 +1098,131 @@ void CheckErrorDialogLifecycle() {
                   static_cast<int>(0x80ed0001u),
           "termination did not restore the uninitialized state");
   check_state("final state", 0, 8);
-  ErrorDialog::SetVisibilityCallback(nullptr);
+  SystemDialog::SetVisibilityCallback(nullptr);
   Require("ErrorDialog", "lifecycle without a visibility listener",
           ErrorDialog::ErrorDialogInitialize() == 0 &&
               ErrorDialog::ErrorDialogOpen(&param) == 0 &&
               ErrorDialog::ErrorDialogClose() == 0 &&
               ErrorDialog::ErrorDialogTerminate() == 0 &&
               ErrorDialog::ErrorDialogGetStatus() == 0 &&
-              !ErrorDialog::GetVisualState().active &&
-              ErrorDialog::GetVisualState().revision == initial_revision + 10 &&
+              !SystemDialog::GetVisualState().active &&
+              SystemDialog::GetVisualState().revision ==
+                  initial_revision + 10 &&
               notifications.size() == 8,
           "guest lifecycle depended on a registered host visibility listener");
   std::printf("[host]    %-32s ok\n", "ErrorDialogLifecycle");
 }
 
+void CheckSigninDialogLifecycle() {
+  namespace Signin = Libs::Dialog::SigninDialog;
+  namespace Error = Libs::Dialog::ErrorDialog;
+  namespace Host = Libs::Dialog::SystemDialog;
+  struct Param {
+    int32_t size = 16;
+    int32_t user_id = Config::GetUserId();
+    int32_t reserved[2] = {};
+  } param;
+  struct Result {
+    int32_t result = -1;
+    int32_t reserved[3] = {-1, -1, -1};
+  } result;
+  constexpr int not_initialized = static_cast<int>(0x81350001u);
+  constexpr int already_initialized = static_cast<int>(0x81350002u);
+  constexpr int invalid_param = static_cast<int>(0x81350003u);
+  constexpr int invalid_state = static_cast<int>(0x81350005u);
+  Require("SigninDialog", "uninitialized",
+          Signin::SigninDialogOpen(&param) == not_initialized &&
+              Signin::SigninDialogClose() == not_initialized &&
+              Signin::SigninDialogGetResult(&result) == not_initialized,
+          "uninitialized operations returned the wrong error");
+  Require("SigninDialog", "initialize and close",
+          Signin::SigninDialogInitialize() == 0 &&
+              Signin::SigninDialogClose() == 0 &&
+              Signin::SigninDialogUpdateStatus() == 3,
+          "close must also succeed from INITIALIZED");
+  Param invalid = param;
+  invalid.reserved[0] = 1;
+  Require("SigninDialog", "parameter validation",
+          Signin::SigninDialogOpen(nullptr) == invalid_param &&
+              Signin::SigninDialogOpen(&invalid) == invalid_param,
+          "invalid parameters were accepted");
+  invalid = param;
+  invalid.user_id = -1;
+  Require("SigninDialog", "user validation",
+          Signin::SigninDialogOpen(&invalid) == static_cast<int>(0x81350007u),
+          "an invalid user was accepted");
+  Host::SetVisibilityCallback([] {
+    const auto visual = Host::GetVisualState();
+    Require("SigninDialog", "callback reentry",
+            visual.background == (Signin::SigninDialogGetStatus() == 2),
+            "foreground state did not follow the dialog lifetime");
+  });
+  Require("SigninDialog", "open", Signin::SigninDialogOpen(&param) == 0,
+          "valid sign-in dialog did not open");
+  Host::HostSnapshot first{};
+  Require(
+      "SigninDialog", "visible and backgrounded",
+      Host::GetHostSnapshot(&first) && first.kind == Host::Kind::Signin &&
+          Host::GetVisualState().active && Host::GetVisualState().background,
+      "sign-in dialog was not visible or did not background the application");
+  for (int poll = 0; poll < 8; ++poll) {
+    Require(
+        "SigninDialog", "polling waits for the user",
+        Signin::SigninDialogUpdateStatus() == 2 &&
+            Signin::SigninDialogGetStatus() == 2 &&
+            Signin::SigninDialogInitialize() == already_initialized &&
+            Signin::SigninDialogGetResult(&result) == invalid_state,
+        "polling silently finished sign-in or lost the active initialization");
+  }
+  Require(
+      "SigninDialog", "user cancellation",
+      Host::HostClose(first.generation) &&
+          Signin::SigninDialogGetResult(&result) == 0 && result.result == 1 &&
+          result.reserved[0] == 0 && result.reserved[1] == 0 &&
+          result.reserved[2] == 0 && !Host::GetVisualState().background &&
+          !Host::GetVisualState().active && Signin::SigninDialogClose() == 0,
+      "user cancellation did not finish sign-in and restore the foreground");
+  const int32_t error_param[4] = {16, static_cast<int32_t>(0x80550006u), 1, 0};
+  Host::HostSnapshot error{};
+  Require("SigninDialog", "shared presentation generations",
+          Error::ErrorDialogInitialize() == 0 &&
+              Error::ErrorDialogOpen(error_param) == 0 &&
+              Host::GetHostSnapshot(&error) &&
+              error.kind == Host::Kind::Error &&
+              error.generation != first.generation &&
+              !Host::HostClose(first.generation),
+          "an old sign-in action affected an error dialog");
+  Host::HostSnapshot overlay{};
+  Require("SigninDialog", "overlapping dialogs",
+          Signin::SigninDialogOpen(&param) == 0 &&
+              Host::GetHostSnapshot(&overlay) &&
+              overlay.kind == Host::Kind::Signin &&
+              !Host::HostClose(error.generation) &&
+              Host::HostClose(overlay.generation) &&
+              Host::GetHostSnapshot(&overlay) &&
+              overlay.kind == Host::Kind::Error &&
+              overlay.generation == error.generation &&
+              !Host::GetVisualState().background &&
+              Host::HostClose(error.generation) &&
+              Error::ErrorDialogTerminate() == 0,
+          "closing sign-in did not restore the pending error dialog");
+  Host::HostSnapshot reopened{};
+  Require(
+      "SigninDialog", "reopen and abort",
+      Signin::SigninDialogOpen(&param) == 0 &&
+          Host::GetHostSnapshot(&reopened) &&
+          !Host::HostClose(first.generation) &&
+          !Host::HostClose(error.generation) &&
+          Signin::SigninDialogTerminate() == 0 &&
+          !Host::HostClose(reopened.generation) &&
+          !Host::GetVisualState().active &&
+          !Host::GetVisualState().background &&
+          Signin::SigninDialogTerminate() == not_initialized,
+      "abort did not remove the dialog or a stale host action was accepted");
+  Host::SetVisibilityCallback(nullptr);
+  std::printf("[host]    %-32s ok\n", "SigninDialogLifecycle");
+}
+
 #if KYTY_PLATFORM != KYTY_PLATFORM_WINDOWS
 template <typename Function>
 void ExpectFatal(const char *name, Function function) {
@@ -37149,8 +37261,9 @@ int main(int argc, char **argv) {
     vulkan.CheckPackedTextureComponents();
     return 0;
   }
-  if (argc == 2 && std::strcmp(argv[1], "--error-dialog-only") == 0) {
+  if (argc == 2 && std::strcmp(argv[1], "--system-dialog-only") == 0) {
     CheckErrorDialogLifecycle();
+    CheckSigninDialogLifecycle();
     return 0;
   }
   if (argc == 2 && std::strcmp(argv[1], "--fmask-only") == 0) {
@@ -37716,6 +37829,7 @@ int main(int argc, char **argv) {
   CheckClipControlDepthClipState();
   CheckReferenceClockScale();
   CheckErrorDialogLifecycle();
+  CheckSigninDialogLifecycle();
   CheckVulkan13FeatureRequirements();
   CheckPm4AcquireMemNoOp(vulkan.RuntimeRenderer());
   CheckPm4SyntheticOcclusionCounterDump(vulkan.RuntimeRenderer());