PCTrade
Data Abstract for Cocoa provides two comprehensive samples that demonstrate what a "real" client application that uses Data Abstract would be like. There are two samples, one a desktop application and the other an iOS app, which show different ways of presenting the data and give an overview of interacting with a sample database.
Sample 1: Desktop based application
The PCTradeOffice desktop sample is typically located in /Developer/RemObjects Software/Samples/Data Abstract/Desktop/PCTradeOffice, though you may have installed the sample in another location.
Sample 2: Mobile (iOS) based application
The PCTradeMobile iOS sample is typically located in /Developer/RemObjects Software/Samples/Data Abstract/Mobile/PCTradeMobile, though you may have installed the sample in another location.