How to: Create Registration Step 1... 2.. 3... Etc

Hello,

is there a easy way to make the registration in steps.

• I first need the users to enter a API Key, to fetch some info from a xml document. that will be sendt to step 2...
• Then in step 2, i need the user to select its desirable username from a list, that will be sendt to step 3.
• And in the final step, they are allowed to input Email, Password etc.

I could always go around the Registration module, but i prefer to stay whitin the module. (if you catch my drift:P)