An internet browser can download and process sets of bookmarks, which may be created according to the needs of the user, e.g. "Home", "Office", shown, and may be password protected to create, use or modify. Only one bookmark set is "active" at a given time and user access may be restricted to only those URLs associated with the active set. A "blacklist" bookmark set can be created which contains prohibited URLs. The bookmarks can be automatically updated, e.g. with changes of URL. The bookmark sets have particular application in electronic commerce-related Web sites: a first web page related to a commercial transaction is retrieved by the browser, and parsed to locate an associated first bookmark set (consumer hot list), which is retrieved. This bookmark set contains URLs for Web pages which provide functions for the commercial transaction: preferably the set relates to a standard set of electronic commerce functions for the market segment to which the first Web page belongs, and appropriate URLs customise the set to the first page.
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