TRASHCAN.CTL : Allows you  specify  a list of  names  that
                  users may not use to log on to your  system.
                  In this file,  specify the undesirable names
                  one  per  line.  If for example you did  not
                  want  the names "Sysop",  "Jack  Daniels" or
                  "Superman"  used,  simply put the  following
                  lines in this file:

                       Sysop
                       Jack Daniels
                       Superman

                  The   tests  done  on  names  is  NOT  case-
                  sensitive, so the name "SYSOP" would also be
                  invalid. Names that contain any part of  the
                  names in the list are not allowed either.