Type          : 13
 Name          : User listing
 Optional Data : [/G]

   Displays a list of users in the user file. Lists users name,
   location,  file ratio,  and the last time he/she called  the
   system.  This  function  has  some  basic  pattern  matching
   capabilities  on the  name field.  By default all  users are
   listed. However, if a  /G is specified in the  optional data
   field then the user will only see users who are  in the same
   group.  Note that  this  restriction does  not apply  to the
   sysop.