Specifies the node name of the system(s) to be added to the display.
  The system is assumed to be removed from the display via the REMOVE
  SYSTEMS/ID or /NODE commands. Optionally, ALL can be specified to
  restore all SYSTEMS that were previously removed via the REMOVE
  SYSTEMS/ID or /NODE commands.

  Format:  ADD SYSTEMS/NODE=(node-name[,...])
           ADD SYSTEMS/NODE=("node-name"[,...])
           ADD SYSTEMS/NODE=ALL

  If only one node name is specified, the parenthesis can be omitted.
  Quotation marks are optional except when specifying a system
  with a node name of "ALL."

  Examples:  ADD SYSTEMS/NODE=DARBY
             ADD SYSTEMS/NODE=("DARBY","DOOLEY","ALICAT","ALL")