 <p>You'll want to use the <a href="http://msdn.microsoft.com/en-us/library/ms679347(VS.85).aspx" rel="nofollow noreferrer">FlashWindowEx</a> function. Basically, get a handle to the window, create a FLASHWINFO structure with the handle and how you want the window to flash (continuously, until it's opened, etc), and pass it into FlashWindowEx.</p> <p>edit: Here's an <a href="http://blogs.x2line.com/al/archive/2008/04/19/3392.aspx" rel="nofollow noreferrer">example</a> of how to do it in C#.</p>