/sys$common/syshlp/helplib.hlb LSEDIT, Command Qualifiers, /OUTPUT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  /OUTPUT[=file-spec] (D)
  /NOOUTPUT

  Specifies the file name that LSE will create from the input  file  upon
  exit.   Specifying a file specification on the /OUTPUT qualifier causes
  LSE to ignore the current file information.  By default, LSE creates  a
  new version of the input file.

  Missing components of the file specification in the  /OUTPUT  qualifier
  take  their  values  from  the  corresponding  fields of the input file
  specification.

  Upon exiting, and if the buffer contents have been modified during  the
  editing session, LSE writes other buffers to their associated files.

  /NOOUTPUT prevents the writing back of the main buffer on exit.