Briefcases
Data Abstract for Cocoa comes with two samples that show the use of Briefcases to persist client data in a Data Abstract application.
Sample 1: Console based application
The Console Sample is typically located in /Developer/RemObjects Software/Samples/Data Abstract/Console/Briefcases, though you may have installed the sample in another location.
Sample 2: Desktop based application
The Desktop Sample is typically located in /Developer/RemObjects Software/Samples/Data Abstract/Desktop/Briefcases, though you may have installed the sample in another location.