If you have problems with your PC locking or going to sleep, caffeine
will keep it awake. It works by simulating a keypress once every 59
seconds, so your machine thinks you're still working at the keyboard,
so won't lock the screen or activate the screensaver.
The icon is shown above - it's the leftmost one in the task tray, and
this is all you see. Double-clicking the icon empties the coffee pot
(that's what the icon is) and temporarily disables the program.
Double-clicking it again refills the pot, and will keep your machine
awake.
Windows 98: Caffeine works by simulating left shift key down and up
events every 59 seconds.
Windows 2000/XP: Caffeine works by simulating a left shift key up event
every 59 seconds.
Of all the key presses available, shift is probably the least
intrusive, and least likely to interfere with your work.
http://www.zhornsoftware.co.uk/caffeine/index.html
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