title: Pre-fill a web page from a web page
body: <p>We have a feature in a Windows application that opens a web browser, navigates to certain pre-configured web sites, and auto-fills the forms with data from our database -- it's a convenience feature for users.</p>
  
  <p>Now we want to build an Asp.Net version of this feature so that from our web app, the user clicks a link/button, and we open the page (with a redirect? with JavaScript?).  Then we fill in the form so that the user can review the data and submit it.</p>
  
  <p>To do this, I think that we would either need to inject javascript into the browser frame that is loading the external window, or we would need to be able to interact with that window.</p>
  
  <p>We are worried that browser security might not allow this -- it could look like some sort of spoofing attack.  What would be a good way to do this?</p>