Library /sys$common/syshlp/tracehlp.hlb SPAWN, /INPUT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    /INPUT=file-spec

    Specifies an input file containing one or more DCL commands  to  be
    executed  by  the  spawned  subprocess.   If  you specify a command
    string with the SPAWN command and an input  file  with  the  /INPUT
    qualifier,  the  command string is processed before the input file.
    Once processing of the input file is complete,  the  subprocess  is
    terminated.