The Chat Purger provides a way for administrators to purge all statements in a chat room. This can for example allow an administrator to prepare the room for another group of participants or eliminate a conversation that shouldn't be read by later visitors.
The Chat Purger entity embeds a link in the room which when followed will purge the room. Only those in a group with access to the entity (defaults to the webmaster) will see the link and be able to do the purging.
A common use of the Chat Purger is to add the entity reference &chat.purger; in the bottom of a room. This way, administrators can purge a room by selecting the "Purge Room" link in the bottom of the page.