The fastest way to get all the licenses back in the "pool" is to Stop, then ReStart the License Manager on the Server. This does throw everyone off, but all the licenses are then available.
As to monitoring license usage, if you're running Version 5.20 you can bring up "Admin Control Center" to see which workstations have licenses. You can bring up the ACC by typing "http://localhost:1947" in the address bar of Internet Explorer. Then click on "HASP keys" on the left, then on the specific key in question. (You may have to do this on the server if workstations haven't been given permission to access the ACC.)
If you're running something earlier than 5.20, you'll have to use the MONITOR utility. You can find this below CAESAR II in \assidrv\monitor.
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Regards,
Richard Ay - Consultant