When connecting to a server, this variable is checked versus the number of users currently connected to the ircnet. If the number of users is less than the setting of MINIMUM_USERS, you will automatically be disconnected from that server and IRCII will attempt to connect to the next server in you server list (as though you had some server +). This is useful if the net is fragmented to keep you on a more populated portion of the net. This will be rechecked if you issue a LUSERS. This only affects your primary server. Secondary servers are not affected by this variable.
See Also: set/minimum_servers server lusers ircii/server_lists