Int 21 Fn 8E00  - European Ms-dos 4.0 - "setpri" - Get/set Process Priori  [D]

   AX = 8E00h
   BH = 00h
   BL = action
       00h set priority for command subtree
       01h set priority for specified process only
   CX = Process ID
   DH = 00h
   DL = change in priority (00h to get priority)

Return: CF clear if successful
       DL = process priority
       DH destroyed
   CF set on error
       AX = error code (01h,no such process)(see #1366 at AH=59h)
Desc:  specify or determine the execution priority of the specified process
     or the process and all of its children

See Also: AH=81h