as Jeff has said - there is no multitasking available to the palm os developer (pre cobalt). Everything that looks like it's running in the background is in fact interrupting the program flow in response to an alarm or notification.

alarmlist (free @ palmgear) will show you what is registered - you'll be surprised how much is!

the one thing that does seem to run independantly on the treo is the phone - though the control s\