Content-specific URLs (CSURLs) are efficiently created to identify documents and intended visible content (Intended Content) within the documents that may be the whole of or only parts of the documents. The Intended Content of CSURLs can be affected, e.g. in the live web, by linkrot or content modification. Activation of CSURLs in conventional user agents (e.g. web browsers) results in automatic opening of underlying documents and/or offers to upgrade to a more capable user agent. Activation of CSURLs in a capable user agent result in automatic finding and distinguishing, e.g. by highlighting and scrolling, of matching content, which is robust in many circumstances wherein Intended Content has been non-trivially altered.