This event is advisory only.
Event data is the $ACT variable
The default action is to display an "unknown action" message

The event is triggered by tpl_content if it does not recognise the $ACT value. It is
the complement to event 'ACTION_DISPATCH'.  Handlers of this event can output XHTML
which will be displayed in the main dokuwiki window - ie. where the wiki page would
normally be displayed.

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