## Virtual Device Driver Reference for OS/2

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### VDHExchangeMem - Parameters

Source (PVOID) Address of the source data.

Destination (PVOID) Address of the target region.

NumBytes (ULONG) Number of bytes to exchange.

rc (BOOL) - returns

Success If the function is successful, it returns a nonzero value.

Failure If the function fails, it returns 0 (zero). VDHGetError should be called to determine the nature of the problem.