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Is there a way to use ViewState, Session state or some way to set a variable that would only allow exclusive access to a page?
For example, when the first user opens the page a certain state or cache variable would be set. Then you would test the variable when other users tried to open the page and they would be redirected if anyone already had the page open.
You could use an Application variable rather than a session or write a value to a database but the main problem i can see you having is knowing when a user has finished with that page. All would be good and well if they left the page by clicking on a specific button or something but how would you handle someone simply closing their browser down?