The most basic description is that @In and @Out just replaces the glue code you
have to write to get things out of some context (Session, Request, Application
and, in Seam, Conversation scopes). Rather than having:
String param = request.getSession().get("param");
you have:
@In(scope=ScopeType.SESSION)
String param;
Be careful though. I realized (sort of late) that bijection apparently happens
for value-binding method calls too, so if you're injection a lot, you will pay
a price in RENDER_RESPONSE. In our case, we had a huge form with many
validation error messages from the resource bundle.
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