Say , I have two domains abc.com, and xyz.com
I use a free hosting account, so I'm allowed only one domain
So can anyone tell me how i can go about this:
I want xyz.com/folder/home.php to show the page at abc.com/folder/home.php, but still show xyz.com/folder/home.php in the url box
I can change DNS records, but I don't have htaccess on my host

buy some proper hosting or alias the other domain using DNS

Well there's always the frames option, but that's not good practice.

Chris' option of getting some proper hosting is the best idea - it doesn't cost much as like $50 can easily purchase a years hosting with a reliable company (about $4 per month)

Dan