ClickZap

ClickZap allows you to run a predefined action when you right click two
or three times at your current mouse double-click speed. There is no
faster way to lock your computer when screen security is needed quickly.
http://www.bartdart.com/
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The best of the best in Windows=3F Freeware,
as determined by the readers of alt.comp.freeware
http://www.pricelessware.org