Just set up a timer?

All my editing is done via pop-up forms if the timer is not
reset, then the form closes. If they had not completed an
operation I tend to just roll-back because they have
probably been called to a more urgent function, and will
have to restart what they were doing anyway. <Cancel> always
scraps the work and closes the pop-up.

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Lester Caine
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L.S.Caine Electronic Services