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Eric Lewis edited this page Jul 22, 2015
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When setting up a Multisite install, the network is configured to create sites either as subdomains of the root site (e.g. subsite.network.com) or subfolders (e.g. network.com/subsite).
Domain Mapping is the process of mapping any arbitrary domain (called an alias) to load a site. If an alias of arbitrarydomain.com is set for the site network.com/subsite, the site and wp-admin interface can be accessed over either domain.
Internally, Mercator looks at a request's domain and informs WordPress what set of tables to use. User authentication cookies are set for all domains in the network, so a user logs in on one site and is authenticated across all.