Also Lightspeed C, if memory serves, got in early dibs. Worked nicely, many fewer floppies than MPW. Was IDE, though. P.S. demallien is completely right. S.O.P

Also Lightspeed C, if memory serves, got in early dibs. Worked nicely, many fewer floppies than MPW. Was IDE, though. P.S. demallien is completely right. S.O.P. was to hang your code from the GUI event loop (skeleton samples provided).