Avoid multiple users on server app?

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Avoid multiple users on server app?

I know this should be possible but I haven't yet figured out how to protect an app from being used by more than one person at a time.

The app will reside on a school server and, as two different groups are going to use the same app (it's a game board) —but not simultaneously — I want to lock one side out while it's in use by the other.

Please point me toward a solution, if you will. Thanks.