Source : Free On-Line Dictionary of Computing

Lan Manager
     
         {Microsoft}'s {OS/2}-based {network
        operating system}.  Developed in conjunction with {3Com}, Lan
        Manager runs as a task under OS/2.  Because of this, a {file
        server} may concurrently be used for other tasks, such as
        {database} services.  It offers good {mulitasking}.
     
        (1997-03-19)