Restore SEBPatch

SafeExamBrowser.WindowsApi/Desktops/Desktop.cs

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2024 ETH Zürich, IT Services
+ * Copyright (c) 2025 ETH Zürich, IT Services
  *
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
@@ -26,12 +26,22 @@ namespace SafeExamBrowser.WindowsApi.Desktops
 
 		public void Activate()
 		{
-			
+			var success = User32.SwitchDesktop(Handle);
+
+			if (!success)
+			{
+				throw new Win32Exception(Marshal.GetLastWin32Error());
+			}
 		}
 
 		public void Close()
 		{
-			
+			var success = User32.CloseDesktop(Handle);
+
+			if (!success)
+			{
+				throw new Win32Exception(Marshal.GetLastWin32Error());
+			}
 		}
 
 		public override string ToString()