Or maybe they should just hit the 'del' key.
I'm sorta puzzled how it could be a 'pre-unix' system when unix was developed around 1969, and Jay Miner's vision of the Amiga sprung from his love of the (then new) 68000 - a chip which first had initial engineering samples released in 1979...
I mean Jay was ahead of his time... but not 'Bill and Ted's Excellent Adventure' ahead!