/sys$common/syshlp/helplib.hlb LBR Routines, LBR$CLOSE, Description  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    When you are finished working with a library, you should call
    LBR$CLOSE to close it. Upon successful completion, LBR$CLOSE
    closes the open library and deallocates all of the memory used
    for processing it.