is it possible to have more than one domain on one vshare installation?

ie if some one enters via www.mysite.com or www.mysite.net the domain will always be the same as the one entered with?

I have tried a few ways that i know of and everytime i click a link it just sends me back to the main domain?

Basicly this is only needed to increase my traffic.

many thanks for any info on this matter