Naomi,

I have these commands in the main program of the application:

do mainmenu.mpr
on shutdown do shutdownprogram

read events

I put assert command into shutdown program. However, it's not being called when I try to close the application in IDE by clicking on the x of the screen.
What is it called then and why this program is not called?

I usually do a VerifyQuit() trap on at least two spots: In a menu option, and putting the same code in the QueryUnload() event (this event fires when one tries to close a form using the X button.)