Here is a link to the DataSocket overview. This has a good description of what it is and would be a good beginning reference.
DataSocket Overview
If you are looking for a more technical approach then here is a technical paper about ways that DataSocket can be integrated into a test and measurement system.
DataSocket Technical Overview
These should be a good starting point for you. ThomasD also has posted some good resources that you could use to search for more specific questions about DataSocket.
Hope it helps!
Andy F.
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National Instruments