if you have PalmOS Reference which comes with PalmOS SDK then check User Interface/Notifications/Notification Reference for list of notifications and their description, from these you should be able to choose which one fits you the best
you write about buttons, so it will be most probably sysNotifyVirtualCharHandlingEvent, but better check yourself if it is exactly what you need -- For information on using the PalmSource Developer Forums, or to unsubscribe, please see http://www.palmos.com/dev/support/forums/
