How can I embed an vb asp page inside another? kind of like in a frame (vb frame control, not an html frame).

Basically i am designing a very complex intranet page with many different features, e.g. a poll, welcome note, simple BBS and it will get very complicated with it all in one aspx file. I really need one aspx file to do each job and somehow embed it in the master one in the right place. any ideas?