X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - lantastic

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INT 21 - LANtastic - COPY FILE
        AX = 5F97h
        CX:DX = number of bytes to copy (FFFFFFFFh = entire file)
        SI = source file handle
        DI = destination file handle
Return: CF clear if successful
            AX:DX = number of bytes copied
        CF set on error
            AX = error code
Note:   copy is performed by server

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