This video is put up show how to use AppSync in general, show how to use AppSync with packaged apps having separate data container files and/or multiple entry point EXEs, and discuss what is required when needing to have clients download just the differentials vs. the whole updated ThinApp packaged app (i.e. slow links, remote/home users/etc.)

Source: http://blogs.vmware.com/thinapp/2009/11/appsync-explained.html