Provide a list of Identity Provider entityIDs to let the user choose from on the login page.<br />On each line there must be a comma-separated tuple for entityID of the IdP (see the Shibboleth metadata file) and Name of IdP as it shall be displayed in the drop-down list.<br />As an optional third parameter you can add the location of a Shibboleth session initiator that shall be used in case your Moodle installation is part of a multi federation setup.