... I don't believe I ever used a shell goto, because I knew how it worked--maybe even spinning a tape drive, not too different from running a loop on the IBM CPC. There you stood in front of the program "read head" (a card reader), grabbed the "used" cards at the bottom and put them back in the top feed. Voila, a program loop. The shell goto differed in that it returned to the beginning by running the tape backward rather than going around a physically looped path. And you didn't have to spin the tape by hand. It also reminds me of George Stibitz's patent on the goto. The idea there was to stop reading this tape and read that one instead. The system library was a bank of tape readers with programs at the ready on tape loops . (This was in the late 1940s. I saw the machine but never used it. I did have hands-on experience with CPCcards.) Doug