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Very short TS2068 BASIC listing using ON ERR GO TO that creates a continuously running program immune to BREAK, key presses, and normal interrupts: line 10 sets ON ERR GO TO 20, line 20 prints INKEY$ and loops. Author (unnamed, from ATSU Newsletter, Central Ohio) reports being unable to stop it by any means tried, and suggests it could form the basis of nearly unbreakable T/S programs.