Permits you to switch control of your  terminal  from  your  current
  process to another process in your job.

  The ATTACH command allows you to move quickly between processes that
  you have created with the SPAWN command.  For example, while you are
  editing a file, you can SPAWN a subprocess (MAIL) to read a new mail
  message.   Enter the ATTACH command to get back to back to the
  editing session.  If you  want to read another new mail message, you
  can use the ATTACH  command to get back to the  MAIL subprocess you
  already created.

   Format:

       ATTACH [/PARENT] [process-name]

Additional information available:

ParametersQualifiersExamples

 process-name

  Indicates the name of the subprocess to which the connection  is  to
  be made. Only the /PARENT qualifier or a process-name may be specified.

Additional information available:

/PARENT

   Allows you to attach to your process' parent process.
    If there is no parent process an error message is printed.

  1.
       $ SPAWN MAIL
       %DCL-S-SPAWNED, process MAGNANI_3 spawned
       %DCL-S-ATTACHED, terminal now attached to process MAGNANI_3
       MAIL> ATTACH MAGNANI_2
       %DCL-S-RETURNED, control returned to process MAGNANI_2
       $ ATTACH MAGNANI
       MAIL>


  This  example  shows  how  to  spawn  subprocesses  (MAGNANI_2   and
  MAGNANI_3)  to  move  from  MAIL to DCL back to MAIL.  The ATTACH
  command  allows you to transfer control between subprocesses.


                                  NOTE

      You always SPAWN a new process and ATTACH to a process  that
      already exists.