JSI Tip 8925. Freeware Caffeine prevents your PC from locking or going to sleep.

Download and unzip Caffeine.

The readme.txt file contains:

caffeine
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Run this to prevent your PC screen from locking.  It does this by simulating
that you've pressed the shift key once every 59 seconds.

Double-click the icon to temporarily disable Caffeine, and permit your screen
to lock.

Under Win98:      a key down and then a key up event is simulated
Under Win2000/XP: a key up event is simulated

The additional event is required under Windows 98, otherwise the screen will
still lock.

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Copyright Tom Revell, [email protected]
Zhorn Software, http://www.zhornsoftware.co.uk/