Running an external program inside another form

Question

hello,
i have a windows application which is fully self sufficient..it has a form with a few controls and the usual event handling... i made another windows application with a tabcontrol with a tabpage inside it..i want to load the form of first application inside the tabpage of second application.. so that it feels like the first application is fully inside the second one..i should be able to load and unload instances of the first form..is there any way i can do it ? both shud not be dependent on each other..so if user wants he can load the first form without help of second.. please point me in the right direction..
project is in C# ..
Thank You !