I would like to set thread prefixes so that any thread in forums in root Category X has prefix XXX (same name as the Category) Please tell me if Prefixes will do this. I do not want this as a user option but automatic default that cannot be user opt out. Also what is a Prefix Group? LATER Um I made one to test - named one of the coloured buttons and then selected a Categorty under Nodes and Permissions. Left ALL selected for userghroups.No effect whatsoever. When I go in that Category and click to start a new thread it looks just as usual - no prefix even as an option.OK messed up wha? If I click what appears to be a link beside an individual button nothing happens. So I put the prefix text I want in the Title textbox.That has named ALL the buttons with that label.