/sys$common/syshlp/helplib.hlb UIL, /OUTPUT[=file-spec]  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Negative form:  /NOOUTPUT

  Controls whether the compiler produces a User Interface  Description
  (UID) file.  The default output file type is .UID.

  Specify /NOOUTPUT when you want to compile a specification to obtain
  only  a  listing,  or  when  you  want  the  compiler  to  check the
  specification for errors only and to display diagnostic messages.

  The default is /OUTPUT.