Thank you Robert. This document is much more comprehensive than anything I have come up with in the past while searching Apple's site. I probably missed it when browsing. I am up to page eleven and I have two major questions already. However they probably stem from indigestion. I'll be back. Peter >> Can anyone point me to a succinct description of the "Carbon Event >> Model"? > ><http://developer.apple.com/techpubs/macosx/Carbon/oss/ CarbonEventManager/Carbon_Event_Manager/CarbonEvents.pdf> > >Robert P.