Specifies the system ID number of the system to be removed from
  the display.  The system ID can be any of the valid IDs as
  displayed in the SYS_ID field.  To specify a hexadecimal value
  as the ID number, precede the value with %X.  Optionally, ALL
  can be specified to remove all systems from the display.

  Format:  REMOVE SYSTEMS/ID=(system-ID[,...])
           REMOVE SYSTEMS/ID=ALL

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

  Examples:  REMOVE SYSTEMS/ID=101
             REMOVE SYSTEMS/ID=(206,%XF2A)