How to change URL

I'm looking for a way how to change URL i开发者_如何转开发n browsers address bar. For example user writes "www.domain.com/somepage"; and I want to that user only see this: "www.domain.com"

How I can do this?

Use iframe, frameset or ajax loading page. However, all of them are bad for SEO.

The good one to use is .htaccess URL rewrite, and set write www.domain.com -> www.domain.com/somepage

You could potentially use HTML frames, its not elegant, but with the vagueness of your question and tagging this may work for you.