Not really sure to be 100% honest.
The Rel2Abs line is really only needed if you are Framework builder to add the data assist forms as an Include. if your not using framework builder, commenting that line will have no effect.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.