The following functions are additional to WPMU and constitute its API:

Many of the problems we face are because the software lacks good documentation. Please help by creating a page for each of these functions and tagging them with the categories WPMU and WPMU Functions.

You may find this template function useful WPMU_Functions/template as a starting point for your documentation.

You can find a full list of all the WPMU Functions (documented or not) here WPMU_Functions.