Retrieves the URL for the current site where the front end is accessible.

Install global terms.

Install Network.

Determines the status we can perform on a plugin.

Whether a child theme is in use.

Is the query for a comments feed?

Deprecated functionality to determin if the current site is the main site.

Determine whether a site is the main site of the current network.

If Multisite is enabled.

Determines whether the given ID is a navigation menu.