Source : Free On-Line Dictionary of Computing

Virtual Loadable Module
     
         (VLM) {Novell}'s term for software modules that
        can be dynamically loaded to extend the functionality of the
        "VLM" {NetWare Requester} for {MS-DOS} that became standard
        beginning with {Novell NetWare} 4.
     
        (1995-01-11)