We had no way to prove or disprove whether the keystroke happened, but the program lived up to its billing: we left the computer idle for several minutes, which normally would have resulted in the screensaver kicking in, and nothing happened. The program's description claims it simulated a keystroke once a minute in order to keep our computer from going to sleep. It's pretty much impossible to be confused with such a simple layout. Caffeine basically has only an on/off switch. We enjoyed this program's interface, because it didn't try to overextend itself. It's handy for times when you don't want a screensaver but also don't want to change your desktop settings. Like a strong cup of coffee, the program prevents your screensaver from kicking in without your having to disable the screensaver itself. Caffeine keeps a computer from locking up or falling asleep by regularly simulating keystrokes.
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