... You have to have ROOTCHANGE access to create a top-level web (one with no parent) . ... While creating the new web, TWiki will update the following variables in the WebPreferences : WEBBGCOLOR , SITEMAPLIST , SITEMAPWHAT , SITEMAPUSETO and NOSEARCHALL . ... If you plan to rename the Main web, remember that TWiki stores user and group topics in this web. ... This potentially large change can be performed automatically if you rename the web from the Tools section of WebPreferences , as described above...