Any way to tell the WebBrowser control to start in 'nomerge' mode if user has IE8

Our application uses a webbrowser control on a form to navigate to our website when a certain action is performed on our 'text-based' legacy application.

All was fine in IE5, 6 and 7 but now it appears IE8 shares session cookies not only between tabs in the same intance but also between all instances. This is a major bother if a user wants to have two separate in开发者_C百科stances looking at different client details at the same time.

One can disable the latter behaviour by starting IE with the command line switch -nomerge.

Does anybody know how we can achieve the same effect programatically with the WebBrowser control?

Thanks in advance chaps.