>my problem is i have a function i my program called trap_Error
>and i want to disable it just for a couple of instruction
>so how can i do

Robert,
There is no list. Any command (or function or even assignment) could follow an 'on error'. ie:

on error do myErrhandler with lineno(),message()
on error m.myVar = 3
on error xx=myFunc()

Common ones :
on error do errorhandler
on error retry
on error return

For your case :

on error && Disable custom error trapping
* Do whatever
on error do trap_Error && Restore handler back

Cetin