Multitasking using events

Hmm yes sorry other than WaitEvent, functions that call PollSystem and hence allow system events to be processed causing hooks to happen and events to be queued include:

PeekEvent
PollEvent
AppSuspended
AppTerminate
KeyHit
KeyDown
GetChar
FlushKeys
MouseX,Y,Z
FlushMouse
MouseHit
MouseDown
WaitKey
WaitChar
WaitMouse