
Multisite
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Since Version 3.0 , WordPress includes new multisite features, meaning that it can run many blogs, even with their own separate domains, on one WordPress installation. This tutorial explains how to migrate multiple WordPress installations into one new WordPress multisite. You can migrate sites that are using their own domain, as well as sites using a subdomain on your main domain. This tutorial assumes that you are hosting WordPress on a site using cPanel.
Migrating Multiple Blogs into WordPress 3.0 Multisite « WordPress Codex
WordPress 3.0: Multisite Domain Mapping Tutorial ? Otto on WordPress
Enabling Wordpress 3.0 multi-site « CatN
WordPress 3.0 integrates the old WordPress MU (Multi User) version into a single version that supports multiple sites on multiple domains on a single WordPress install. Your CatN vCluster makes an ideal platform for running a WordPress blog farm. If you’re looking for unlimited domains (including vanity domains!) from a single WordPress installation, this guide will get you up and running in no time. You need to open your vCluster setting page to retrieve your database information which is available on the CatN Control Panel: https://passport.fubra.com/site/cat/login/ .Enable MultiSite in WordPress 3.0 - How to Create a Network | Developer's Mind
WordPress 3.0 signals the merge of WordPress and WordPress MU, and allows you to manage a network of sites in WordPress. In this post, I’ll show you how to enable the Network screen and the MultiSite features in WordPress 3.0. You do not need to complete these steps if you are upgrading from WordPress MU. Follow the instructions here to upgrade from WordPress MU .Debugging a WordPress Network « WordPress Codex
As of WordPress 3.0 , you have the ability to create a network of sites by using the multisite feature. This article contains instructions for creating a multisite network. A multisite network can be very similar to your own personal version of WordPress.com.

