Creating a web form filler but not sure where to begin

Hey guys I actually updated my previous post because why buy it if you can build it right?

But I'm trying to figure out how to build a web form filler similar to Roboform that allows the user to create a series of values like username, password, etc and then be able to navigate to a website and have a web form filled out automatically.

What would be the best route to begin this type of application?

Dictionary of all possible web elements that a form could have?

Not looking for code but the right path to begin programming a beast like this.

Thanks guys

There's a beast for this already and it's called zennoposter :B


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