Source : Free On-Line Dictionary of Computing

EMM386
     
         An {expanded memory manager} for {IBM PCs}
        with an {Intel 80386} or higher processor, part of {MS-DOS}
        version 5.00 or higher.  EMM386 uses {extended memory} to
        simulate {expanded memory} and also provides {upper memory
        blocks}.  It must be loaded by a DEVICE= command in your
        {CONFIG.SYS} file.
     
        (1996-01-13)