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Write a hello world GUI program that closes itself after three seconds (shortest code)

Write a program in any language, so long as it has GUI support for a window system (cannot be text-consoles, etc., and must be a GUI/toolkit/window).

The program must say hello world in any manner (splash image, menu bar, status bar, title, video, message box, other widget stuff, etc.), so long as a GUI-compliant window appears and shows this text for three seconds. The person who can code this in the least amount of code used, including NBSP, will take the cake.