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  1  definition  found 
  From  The  Free  On-line  Dictionary  of  Computing  (13  Mar  01)  [foldoc]: 
    An  {IBM  PC}  {extended  memory  manager}, 
  part  of  {MS-DOS}  version  5.00  or  higher.  HIMEM  can  also  act 
  as  an  {A20  handler}.