the value of this variable comes from LanguageConverter indexed by page_id indexed by prefixed DB keys on which the links will be shown can modify can modify can modify this should be populated with an alert message to that effect to be fed to an HTMLForm object and populate $result with the reason in the form of[messagename, param1, param2,...] or a MessageSpecifier error messages should be plain text with no special etc to show that they re errors
static getLink( $ugm, IContextSource $context, $format, $userName=null)
Gets a link for a user group, possibly including the expiry date if relevant.
static getMain()
Get the RequestContext object associated with the main request.
An error page which can definitely be safely rendered using the OutputPage.