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IScVxCapabilities::RfbProtocolVersionMajor Property
Returns the major version number of the RFB protocol version used to communicate with the VNC server. You should call this method only when connection has been
established already.
Syntax
HRESULT IScVxCapabilities::get_RfbProtocolVersionMajor(int* pnMajorVersion);
Return Value
Returns S_OK if successful, or an error value otherwise.