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.

Caffeine for Windows is the most popular Windows alternative to Amphetamine.
- Caffeine for Windows is Free and Proprietary











































it measures what the system actually does