Adding Project to Existing Project Help

[mcbigj]

Hello,
I'm building an app and want to add an existing application (Project) to my main app. Well I can ad the project easily enough by right clicking the solution in the sol. explorer. The problem is, I'd like to be able to open a form from the added project, using a call from my main project. I would have thought it would have been as easy as using the full namespace, but it's not working. Now I have a feeling I need to get into Assembly stuff. Does anyone know what I need to do here?

Thanks,

 

[mcbigj]

I should actually add that the additional project is already complete, and I won't be editing it. I just want to be able to access that projects tools from the orignal project.