>Write a program to handle the logging of errors and call it with the ON ERROR command. Then make sure there is NO CODE in any ERROR event anywhere (the error event will override the ON ERROR routine).

Is it true such that:
On Error Do Error_Routine
Do Form MyForm
where-
MyForm.control1.error = No code at all
MyForm.control2.error = existing routine

Case of:
error in control1 -> Error_routine
error in control2 -> existing local error event

I think that is what you said, but i wanted to clarify.