Good way to delete handles on CTRL-C?

[gummbeey]

Is this a good way to make sure the persistent program handles are deleted when the user presses CTRL-C?

on "F4" anywhere
do:
run deleteHandles.
end.
 
 
main:
do:
do on stop undo, leave:
	display "main".
	/* run program set persistent vHandle. */
	wait-for "F4" of this-procedure.
end.
run deleteHandles.
end.
 
 
procedure deleteHandles:
message "deleteHandles" view-as alert-box.
end.