Is it possible to change page content based on 'case' or 'workflow' state (or similar method)

Is it possible to change the page content if the customer revisits the page?

I have an approval page which the customer completes - when they submit the form with their answers a case is generated and they are taken to a submission successful page.

As they can revisit this page through their account details I want the page to change to say they have already submitted their approval.

Is there a method within business catalyst to achieve this?

Can I extend the CRM database to use a flag for the case and then set / check the state of that flag when the page is visited again?

Thanks in advance.

Gavin