The best starting point is to use the “Tools|Remoting SDK & Data Abstract|Connect to Relativity Server” menu to connect your existing app to your server. This will add the necessary DA referenes and generate some helper code to get you connected.
i hope this sample will help you get started, as well.
Yes, that won’t work. the Data Abstract API is tailored for each platform, and thus is significantly different on Cocoa than it is in .NET (not in DA concepts, but in what classes and methods are called and how they are designed). The .NET code won’t just easily run or be adjusted for Cocoa. (See some of my replies in this thread for why that is, right now).