>If other user using this table on i:\prg ,i want to trap error and ignore my line of code.
>If any other user using this exe file I want to ignore my line of code.

Simply, you can do:

lcError = on('error')
on error *

*Code here will not throw errors

on error &lcError

But, in your error hanlder, you should have a property or something that allows you sto surpress any errors that come along.