1. the real-time operating system nucleus.

2. (TRace ON) A command used when debugging programs written in early line-numbered basic that contained goto and gosub statements.

When the TRON command had been executed, the program ran with a window open indicating the line number being executed at that instant.

The troff (an abbreviation for "TRace OFF") command turned the tracing off.

(nrl, cmu, probably from the film "Tron") To become inaccessible except via electronic mail or talk especially when one is normally available via telephone or in person.

Compare spod.

[jargon file]