THere is an article on my web site that discusses how to limit simultaenous users. You can use the same idea.

>I would like to know if there is a way to make my application aware of other users on the LAN who are presently logged into the same application. I could create a table, append a record with a user's name when he logs on, and then the other users could query the table to find out who is presently logged on.
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