[jeff.piper]

If a all slots on the server are full you can still assign individual login accounts the right to automatically boot a less powerful account from the server in order to make room for them.

Each account can be assigned an "In reserved list" right. If this right is enabled for your account and the server is full then the server will search for any guest client and kick one of them first. If no guest client is found the server will then search for a client that does not have the reserved right set. If none of these are found the server will simply say that the server is full and to try again later.

If your account has the server admin right then the above search sequence will still happen but it will go one step further. It will search for a client that does not have the server admin right and then kick them as a last resort. This way server admin's can always get into the server.