If you call YourForm.Activate() the titlebar and taskbar button should flash if the user is working with another application. If you want to explicitly cause the flashing, you can call the FlashWindow[Ex] Win32 API.
http://msdn.microsoft.com/library/en-us/debug/base/flashwindowex.asp http://msdn.microsoft.com/library/en-us/debug/base/flashwindow.asp
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