Hi.
For the very first example (Registration), under 1.2.2 How It Works, it says,
When the form is submitted, JSF asks Seam to resolve the variable named user. Since there is no value already bound to that name (in any Seam context), Seam instantiates the user component, and returns the resulting User entity bean instance to JSF after storing it in the Seam session context.
Yes, it does, but let's keep it simple ;-)