I have a domain http://www.example.com which has a hosting package and website on it.

I also have a http://example.no-ip.org domain which contains some content I would like to appear under the same domain.

Can I setup a .htaccess file at http://www.example.com/proxy/ which proxies the files at http://www.example.no-ip.org/files/

Similarly, could I host an entire domain in the same way?, e.g. http://www.example2.com/ proxying http://example.no-ip.org/files2/

Alternatively, if someone were to say "That's stupid, use this free (or super-cheap) dynamic DNS host:" I would probably accept that answer.