1.all> DEFINE/PROCESS_SET SERVERS=FILE_SERVER,NETWORK_SERVER
      all> SHOW PROCESS SERVERS
       Number  Name               State   Current PC
      *    1 FILE_SERVER          step    FS_PROG\%LINE 37
           2 NETWORK_SERVER       break   NET_PROG\%LINE 24
      all>

      This DEFINE/PROCESS_SET command assigns the symbolic name
      SERVERS to the process set consisting of FILE_SERVER and
      NETWORK_SERVER. The SHOW PROCESS SERVERS command displays
      information about the processes that make up the set SERVERS.

    2.all> DEFINE/PROCESS_SET G1=%PROCESS_NUMBER 1,%VISIBLE_PROCESS
      all> SHOW SYMBOL/DEFINED G1
      defined G1
          bound to: "%PROCESS_NUMBER 1, %VISIBLE_PROCESS"
          was defined /process_set
      all> DELETE G1

      This DEFINE/PROCESS_SET command assigns the symbolic name G1 to
      the process set consisting of process 1 and the visible process
      (process 3). The SHOW SYMBOL/DEFINED G1 command identifies the
      defined symbol G1. The DELETE G1 command deletes the symbol
      from the DEFINE symbol table.

    3.all> DEFINE/PROCESS_SET A = B,C,D
      all> DEFINE/PROCESS_SET B = E,F,G
      all> DEFINE/PROCESS_SET E = I,J,A
      %DEBUG-E-NORECSYM, recursive PROCESS_SET symbol definition
           encountered at or near "A"

      This series of DEFINE/PROCESS_SET commands illustrate valid and
      invalid uses of the command.