Library /sys$common/syshlp/lse$clihelp.hlb READ, Parameter  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 file-spec
    Specifies the file to be read. LSE uses the list for the current
    SET SOURCE_DIRECTORY command to resolve the file specification.

    LSE uses VAX DEC/CMS to access a file if the directory for the
    file to be accessed is the same as the current CMS library.