#priority_processing  data processing in which the operations performed are determined by a system of priorities
  supertype:  #data_processing  the temporary retention of data in a processor while calculations or logical operations are performed on it
  subtype:  #background_processing__backgrounding  the execution of low priority programs while higher priority programs are not using the processing system
  subtype:  #foreground_processing__foregrounding  the execution of a program that preempts the use of the processing system

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