Consider a website which is composed of two webforms (for example in two frames) and each one is hosted on a different web server. Is there an easy and secure way to make them share state information with each other? For example, I would like one form to display a picture only if the user can answer a skill testing question in the other form. So form A somehow has to tell form B that it should reload with the picture enabled. I don't want to do it via a cookie on the user's computer, because then the user might be able to fake the cookie and get the picture without answering the question.