Source : Free On-Line Dictionary of Computing

hybrid multiprocessing
     
         (HMP) The kind of {multitasking} which {OS/2}
        supports.  HMP provides some elements of {symmetric
        multiprocessing}, using add-on {IBM} software called MP/2.
        OS/2 SMP was planned for release in late 1993.
     
        (1995-03-19)