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  Interrupt:   15h     Function:   81h
 
  Title:       Device Close
 
  See also:    Device Open, Process Termination
 
  Description:                                               [AT] [PS/2]
 
     Releases ownership of a logical device for a process.
 
     Input               Output
 
     AH = 81h            If function successful
     BX = Device ID        Carry flag: clear
     CX = Process ID       AH = 00h
 
                         If function unsuccessful
                           Carry flag: set
                           AH = Status
                                    -♦-