Keeping a lot of State in your head while modifying a program. "Don' t bother me now, I' m juggling eggS", meanS that an interrupt iS likely to reSult in the program' S being Scrambled. In the claSSic firSt-contact SF novel "The Mote in God' S Eye", by Larry Niven and Jerry Pournelle, an alien deScribeS a very difficult taSk by Saying "We juggle priceleSS eggS in variable gravity." See alSo hack mode. [Jargon File]