Transfers control from your current process (which then
   hibernates) to the specified process.

   The ATTACH and SPAWN commands cannot be used if your terminal has
   an associated mailbox.

   Format

     ATTACH  [process-name]

Additional information available:

PARAMETERQUALIFIER

Examples

process-name
   Specifies the name of a parent process or spawned subprocess to
   which control passes. The process must already exist, be part of
   your current job, and share the same input stream as your current
   process. However, the process cannot be your current process or a
   subprocess created with the /NOWAIT qualifier.

   Process names can contain from 1 to 15 alphanumeric characters.
   If a connection to the specified process cannot be made, an error
   message is displayed.

   The process-name parameter is incompatible with the
   /IDENTIFICATION qualifier.

Additional information available:

/IDENTIFICATION

      /IDENTIFICATION=pid

   Specifies the process identification (PID) of the process to
   which terminal control will be transferred. Leading zeros can
   be omitted. The /IDENTIFICATION qualifier is incompatible with the
   process-name parameter.

   If you omit the /IDENTIFICATION qualifier, you must specify a
   process name.

   1.  $ ATTACH JONES_2

     Transfers the terminal's control to the subprocess JONES_2.

   2.  $ ATTACH/IDENTIFICATION=30019

     The ATTACH command switches control from the current process
     to a process having the PID 30019. Notice that because the
     /IDENTIFICATION qualifier is specified, the process-name
     parameter is omitted.