It appears that the PublishContrib publishes as the user doing the publish process. This means that tricks such as making a cover for TWikiGuest in http://twiki.org/cgi-bin/view/TWiki04/PatternSkinCustomization don't work if you are publishing as a non-authenticated user.

Would providing an alternate user (usable only by TWikiAdminGroup) be appropriate?

e.g.

• • Set PUBLISHUSER = TWikiGuest

Update: I got this to work by having:

      * Set PUBLISHSKIN = anon,pattern
      * Set COVER = anon
      * Set WIKINAME = TWikiGuest
      * Set WIKIUSERNAME = guest 

Where anon was defined in twiki/templates/view.anon.tmpl as:

%TMPL:INCLUDE{"view.pattern"}%
%TMPL:DEF{"topicaction"}%%TMPL:END%
%TMPL:DEF{"toolbar"}%%TMPL:END%

CC