Hi Paul. Although you could set the timer interval to some interval and use the On Timer event to check the value of, say, a global status variable updated within an event handler for the time of the last event I would advise against adopting the approach you are suggesting.
For one thing, there is a very wide range of events to consider, many of them very basic - such as the On Key, Key Up and Key Down events fired for every keypress a user does in a field. For another, you are almost certain to annoy your users (who will end up wanting to use the form at the very moment it times out). And for good measure, what happens when a record is 'dirty' (i.e. has been edited but not stored - you surely don't want to really irritate your users by closing the form in the middle of activity when they just went out for a break...)
I can think of many other reasons not to do it, but instead of listing them suffice to say I just wouldn't go there with this one. That's just my opinion, anyway...
-Stewart
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