Hey everyone,

I have a question about logins.  Let's say that I want to allow each
user account to login only once at a time.  I would then need some kind
of locking mechanism to make sure that the same user can't login again
somewhere else until first logging off.  What's a good way to achieve
this?  I want to be able to handle situations in which the user closes
their browser without first logging off, where I would want to count
that as a logout.

Perhaps I could do some kind of periodic polling in Javascript, combined
with a query to the database that sets a value when the user logs in and
when the user logs out?  I'm just looking for some conceptual ideas. 
Thanks everyone!


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