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Int 16 Fn FFDD  U - PC Tools V6.0+ Pcrun API - ???                         [U]

   AX = FFDDh
   BX = 000Bh
   ???

Return: CX = 5555h if PCRUN active
   DX = 5555h

Note:  also clears flag set by AX=FFDDh/BX=000Ah
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