When there are multiple Web Forms open at once, how can I call a sub or 
change a property on one page from the code on another?  My situation is 
that I have a server control (Infragistics) that implements itself as an 
iframe in the HTML. Inside the iframe there is a Web form with a Windows 
Media player object, which generates events based on markers embedded in 
the video file.  Essentially it's an eLearning application.  When a marker 
is encountered, an event is fired and I would like to post back change the 
active element of the navigation control that is on the outer frame and 
then proceed with the video, or possibly redirect to a Q&A page.

I am currebtly able to do all this using java script and HTML but it seems 
that there should be a more eloquent solution using .NET.

Thanks!

Roger Jolicoeur