I'm working on a Windows 7 PC with ArcGIS 10.1, ArcGIS for Server 10.1, the ArcObjects SDK, and Visual Studio 2010 installed. Everything is licensed.
I am currently working on a WCF REST service that uses ArcObjects. When I open the AddArcGIS Reference dialog, the Server section is disabled. I don't know if there is anything I need in there, but I would like to add any assemblies it may contain so that I can look though them in the Object Browser.
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I've seen some screenshots in the help that show it active. Under what circumstances is it active?