To be honest I'm not entirely sure! However in my case when I had Quartus installed to my F: the Simple Socket Server example would always fail to build since it couldn't find ipport.h and other includes. Now I can build the example with it installed to my C: This weekend I plan on investigating it some more since I need the various internet protocol includes but I don't need UDP or TCP or anything like that. I'll post if I have anything of note to say.
I expect that some libraries still need to be added to a project for it to work, but it expects them on the C: