Wordpress as blogengine documentation

I want to use wordpress as an webl开发者_JAVA百科og engine for my office. the people could be able to register and select their theme, like wordpress.com . but i don't know how can i configure it to be a blog engine not just an alone weblog.

Would you guide me?

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It sounds like what you want to do is build a multisite WordPress installation. Here's the official WordPress site for that http://codex.wordpress.org/Create_A_Network