Command_Qualifiers

/CARRIAGE_CONTROL
  /CARRIAGE_CONTROL
  /NOCARRIAGE_CONTROL

  Determines whether carriage control or line feed characters or
  both are prefixed to the prompt string of the subprocess. The
  default is the current setting of the parent process.

/CLI
  /CLI[=cli]
  /NOCLI

  Specifies an alternate command language interpreter (CLI) for
  the subprocess to use. The CLI you specify must be located in
  SYS$SYSTEM and have the file type .EXE. The default is the CLI
  the parent process uses.

/INPUT
  /INPUT=file-specification

  Specifies an input file containing one or more commands for the
  spawned subprocess to execute. If you specify a command with an
  input file, the command is processed before the commands in the
  input file. The subprocess terminates when processing is complete.
  You cannot use wildcards in the file specification.

/KEYPAD
  /KEYPAD (D)
  /NOKEYPAD

  Determines whether DCL keypad symbols and the current DCL keypad
  state are copied from the DCL keypad in the parent process to the
  subprocess. Use the /NOKEYPAD qualifier if you do not want the key
  settings to be copied.

/LOGICAL_NAMES
  /LOGICAL_NAMES (D)
  /NOLOGICAL_NAMES

  Determines whether the system passes process logical names and
  logical name tables to the subprocess, except those marked CONFINE
  or created in executive or kernel mode.

/NOTIFY
  /NOTIFY
  /NONOTIFY (D)

  Determines whether a message is sent to the terminal to notify
  you that the subprocess has completed or aborted. Do not specify
  /NOTIFY unless you also specify the /NOWAIT qualifier.

/OUTPUT
  /OUTPUT=file-specification

  Specifies the output file to which the output of the SPAWN
  operation is to be written. The default is to direct the output
  to the current SYS$OUTPUT device. When you specify /NOWAIT, you
  should use /OUTPUT to specify an output other than SYS$OUTPUT
  to prevent the terminal from being used by both processes
  simultaneously.

/PROCESS
  /PROCESS=subprocess-name

  Specifies the name of the subprocess to be created. The default is
  USERNAME_n (where n denotes a unique number).

/PROMPT
  /PROMPT[=string]

  Specifies the DCL-prompt string for the subprocess. The default is
  to copy the current prompt string from the parent process. If you
  specify /PROMPT but do not specify a string, the default prompt is
  displayed.

/SYMBOLS
  /SYMBOLS (D)
  /NOSYMBOLS

  Determines whether the system passes DCL global and local symbols
  to the subprocess.

/WAIT
  /WAIT (D)
  /NOWAIT

  Controls whether the system waits until the subprocess is
  completed before enabling more commands to be issued to the parent
  process. The /NOWAIT qualifier enables you to enter more commands
  while the specified subprocess is running. When you specify
  /NOWAIT, you should also specify /OUTPUT to direct output to a
  file (rather than to the screen). This prevents the terminal from
  being used by both processes simultaneously.