>>How about having a glDev variable for development that you turn on which will if true do ON ERROR if not true set up your usual ON ERROR handler.
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>doan unnerstand! How will this help?
>
>Harry

Ok. I believe I misunderstood your first message. If you can isolate the error using SET STEP ON, can you place an ON ERROR right before the error? Does it still call other error code? Are you working in some kind of framework? This is related to a question earlier about using FFC classes.