User Interface Process

More and more I work on web applications (as opposed to websites) that
require rather complex
user process navigation control. To some degree, with careful planning,
some level of navigational control can be achieved through WebForms Page
controller model and the use of controls like the MultiView. However, this
method generally comes at a cost; usually/mostly in ViewState size.

A few years ago, I implemented the MS UIP app block partially to the
purpose of user nav control. The xml navigation maps provided very tight
control over paths
that user could take through the application. I don't want to say
that the UIP didn't have it's issues but it did provide a good level of
user process navigation control plus a lot of the good separation of
concerns due to its MVC aspects.

Over the years I've keep track of the UIP and it kind of has gone away.
Its functionality appears to have been replaced by various implementions:
PageFlow WWF; but this seems like another MS side project; I also see that
asp.net will soon have an MVC option but I've not found any good info on
the out-of-the box controller architecture and if it will support
sequential support user navigational control/routing similar to the UIP.

Question: Is WWF PageFlow a good option for the user process navigation
control in a very high volume business web application? Will MVC support
user process navigation in some form? Are there other
options?

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