RFC libraries for Windows

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ANSWERED April 2005:
There are libraries provided by SAP, such as the .NET connector, used as the interface layer. For older applications there was the DCOM connector. The libraries are provided with the SAPGUI in the RFCSDK directory (librfc32.dll, wdtlog.ocx, wdtfunc.ocx (wd*.ocx). Have a look at http://logosworld.com in the mySAP/NetWeaver section -- there you can find extensive material and examples.