The short is that it's a package we wrote which ties some of the important ADP concepts into Dreamweaver's rendering stage.
Particularly, if you put table elements in a multiple, Dreamweaver has some serious problems.
Our software renders the multiples, and deals with if tags in a sane fashion.
Our designers just edit the adp, and upload it directly to the server.
Caroline Meeks asked me about pricing: we're still thinking about it, but I'll post here when we've sorted out what we'd like to do with it.