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Ctrl+Alt+Del

  Do you know it?

Control-Alt-Delete (often abbreviated to Ctrl+Alt+Del, also known as the "three-finger salute") is a computer keyboard command on IBM PC compatible computers, invoked by pressing the Delete key while holding the Control and Alt keys: Ctrl+Alt+Delete. The function of the key combination differs depending on the context but it generally interrupts or facilitates interrupting a function.

^{http://en.wikipedia.org/wiki/Control-Alt-Delete http://en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_Attribution-ShareAlike_3.0_Unported_License}
 I write about it, because I read that Bill Gates admits it was a mistake. (http://www.pcworld.com/article/2049623/bill-gates-admits-ctrl-alt-del-was-mistake-as-was-dropping-out-of-harvard.html http://www.theverge.com/2013/9/26/4772680/bill-gates-admits-ctrl-alt-del-was-a-mistake) I also prefer a one-button alternative.