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>Ok. That means that I must be carefully to update this property everywhere. In the same time, if a query or any other action that "kills" any timer is longer than the time I established, the app will end as soon as is finished. I think that the original question was about something (API function) more reliable.
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2 things -
1. u can make the delay long enough (e.g. 15 min. or so)
2. u can disable the timer before a big query etc.

Arnon