VMS Help DTM, REVIEW, Review Subsystem, SPAWN, Command Qualifiers, /OUTPUT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

   /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.