i have a project of Call Management System with database SQL SERVER,now i want to limit the connected users in my database in 55 connected users only,where in this 55users can only use the system and if there is 1 user trying to connect on my database the system will no longer accepting this User. and if every user will log out the connected users should be decrement.

You can use table master.dbo.sysprocesses.
This system table contain connected users.

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