Easter eggs for windows

These are tricks created by Software programers as jokes or little games.They give like an autor´s personal touch. In order to enter to one of them there are strage typing combinations that have to be entered correctly. It is unusual to find them as a casuality.6

The following is an example
 
satanic voice

     Go to Control Panel and you double-click the Speech icon.
     In the window that appears enter as a proof text: "am" and you click Test.
     Usually, you will hear satanic voice.
     If you want to try another text and see that it is different from the kind of voice

Some eater eggs for Windows xp are in the links below
http://www.luigix.com/2008/04/17/huevos-de-pascua-trucos-en-windows-xp/
http://www.eeggs.com/tree/5935.html