Defines Multisite subdomain constants and handles warnings and notices.

Defines Multisite upload constants.

Generates and displays a drop-down of available languages.

WPMU options.

Retrieves the URL to the admin area for the network.

Check for an existing network.

Retrieves the home URL for the current network.

Retrieves the site URL for the current network.

Prints step 1 for Network installation process.

Prints step 2 for Network installation process.