The Mac II was one of the first computers to support software-based power-off capability. I wrote Powerless ($19.95) to turn off my Mac at a set time or after a duration. This let me start a time-consuming task (compilation, disk defragmentation, download, etc.) and then have my system shutdown cleanly later.
A new version was being developed when CTSnet came along and stole all my free time. The updated version was an event dispatcher that could shutdown or restart the computer, run an application, play a sound, issue an alert, etc., depending on certain triggers. Triggers included alarm time, countdown timers, idle keyboard or modem activity, etc.
Powerless-2.0.sea 42K self-extracting archive
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