How to merge two different web applications

We have 2 different ASP.NET applications. One Application should show specific information(A) and the other 开发者_如何学Goone should show other information(B). Both applications are from different developers. One ist MVC(A) and the other one is Asp.net(B). Now I want to add a menu in B application to control the A application. So if i click on one button, a frame in the application should changed with the Url of the A applation. Our problem is that we can't merge the code.

I don't want to use IFrames.

Maybe look into virtual directories in IIS

http://support.microsoft.com/kb/172138