Writes the system parameter values from the SYSGEN work area to a
  parameter file, the system image, or the active system.

  Format:

    WRITE filespec
    WRITE CURRENT
    WRITE ACTIVE

Additional information available:

CURRENTACTIVEDEFAULT

file-spec

  The name of a new parameter file to be created; file type defaults to PAR.

  Writes the parameter values to the current system image file,
  SYS$SYSTEM:VAXVMSSYS.PAR, so they will be in effect for the next reboot.

  Writes only the dynamic parameter values to the active, running system.

  Specifies that source information is to be written to the file
  DEFAULT.PAR in your current directory. Requires CMKRNL privilege.