Adding two mashup in a log in page

Hi,

I wanted to know how to add two mashup pages in a log in page?

I wanted to know how to navigate between the mashup for example i give permission for two users to access the login page so that when i enter a user login i wanted the first mashup page to be loaded and when i enter the second user i wanted the second login to get loaded. Please help and share if some tutorials available.

Thank you,

V.Shalini.