... О UNИX . ... site/sidemenu . ... This page, and subpages, is used by the default theme of this site. ... In the theme definition, there is a function called extraObject(d, location) . ... So if a visitor asks for page SomeOtherWikiPage, the theme knows that the "extraObject" it needs to pull into the theme is called MenuPageNotYetCreated, and that file is inserted into the page. ... MenuPageNotYetCreated , it looks for an attachment called MenuPageNotYetCreated attached to page /site/sidemenu. ...