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

       /LOGICAL_NAMES (default)
       /NOLOGICAL_NAMES

    Specifies that the logical names of the parent process are copied
    to the subprocess. When you do not want the subprocess to use the
    logical names of the parent process, enter the /NOLOGICAL_NAMES
    qualifier.