>That's where a timer comes in. You can even have a timer check to see if everyone should be kicked out of your application.

Hi Cheryl,
Thanks for your suggestion.
Yes timers are handy in some places, but you don’t know our users, they don't like being offered things they didn't ask for – like “Hey, there is a new version, get out of here to pick it up!”
There are other valid reasons to not use timers for this (signaling new versions of apps).

dz