Specifies the type of system to be added to the display. Systems of
  the specified type are assumed to be removed from the display via the
  REMOVE SYSTEMS/TYPE command.  The type can be any of the valid system
  types as displayed in the HW_TYPE field prior to their removal. If the
  string which specifies the system type contains spaces, slashes or
  hyphens, then the string must be delimited by double quotation marks.
  If /TYPE=ALL is specified, then all nodes are added to the display.

  Format:  ADD SYSTEMS/TYPE=(system-type,"system-type"[,...])
           ADD SYSTEMS/TYPE=ALL

  If only one system type is specified, the parenthesis can be omitted.

  Examples:  ADD SYSTEMS/TYPE="VAX 8650"
             ADD SYSTEMS/TYPE=(HS90,"VAX 8800")