uuhh, a little enlightenment would be appreciated

I don't get it at all all I can conclude is, IT IS POSSIBLE that a cellular data running concurrently with wireless data connection, since the main topic of that thread is allowing N900 to act as wireless hotspot (wifi, check) to connect to internet using cellular data connection (3G, check)
problem now is, how to make it running the way I want? connect to multiple network at the same time. would be great if it doesn't require a custom kernel as well

thanks a lot for your reply