The tooling can visualize what's going on in the heap, making it easier to spot patterns, and it can even point out some patterns for you and make tuning recommendations.
If the sample HATS web service is running on a network accessible by your instance of an EGL tooling product, then you can begin previewing your EGL Rich UI application at this point.
If you use the WebSphere Application Server migration tooling, you will need to have the old environment available since it will be used as the starting point.