Configuration:
   /etc/gpm2/
      mice/
         default/
            mice-userid:   userid of person reading/writing mice devices
            mice-groupid:  groupid of person reading/writing mice devices

         <name>/
            device:     link or device to use
            protocol:   one line, containing protocol
            userid:     overwrites default/mice-userid
            groupid:    overwrites default/mice-groupid
            options/:   options for that protocol
               <protocol specific configuration>
               

      clients/