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  1  definition  found 
  From  The  Free  On-line  Dictionary  of  Computing  (13  Mar  01)  [foldoc]: 
    An  integer,  string  or  other  small  data 
  value  which  refers  to  one  of  several  objects  allocated  to  a 
  program  by  the  {operating  system},  usually  the  {kernel}.  A 
  common  example  is  a  {Unix}  {file  descriptor}  which  is  a  small 
  integer  that  identifies  an  I/O  channel.  Another  example  is  a 
  reference  to  an  area  of  memory  (e.g.  {shared  memory}). 
  Compare  {capability}.