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Int 16 Fn 6969  - PC Tools V5.1+ Backtalk - Installation Check             [U]

   AX = 6969h
   BX = 6969h
   DX = 0000h

Return: DX nonzero if installed
       BX = CS of resident code
       DX = PSP segment of resident code
       DS:SI -> ASCIZ identification string "CPoint Talk"
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