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

    Specifies a command string to be executed in  the  context  of  the
    created  subprocess.   When  the  command completes, the subprocess
    terminates and control is returned to the parent process.   If  you
    use  both  the  /INPUT qualifier and a command string, commands are
    obtained from the input file after  the  specified  command  string
    executes.