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RC SDK is available, updated OPC documentation

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https://www.microsoft.com/downloads/details.aspx?FamilyID=6db1f17f-5f1e-4e54-a331-c32285cdde0c&displaylang=en

For those of you following my blog for PrintTicket, there's not much in the way of PrintTicket news in the latest SDK. On the OPC side, you'll see no major changes in functionality, though there are a few new error codes and the documentation is substantially expanded. We removed the OPC_STREAM_IO_READWRITE mode from CreateStreamOnFile, since that mode is a bit misleading in terms of intended, supported behavior. The OPC OM APIs don't support an in-place edit model, and even writing back out to the same source data can be problematic with the OPC OM becaue of delay loading. To see the complete set of changes for the OPC Object Model and digitial signature support for OPC, diff the RC version of msopc.idl against the beta version.

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