The bull’s new horn: If you’re tired of Windows on your PC, still grappling with the new Plex style in Windows XP, get ready to be outwitted again in early 2005. Windows’ successor, codenamed "Longhorn", will not be another upgrade but a new experience for geeks, junkies and the careless user. Longhorn promises a brand-new user interface tentatively called Sideshow. But, the grapevine has it that Longhorn won’t be compatible with your existing software or hardware and that an ‘object database’ will replace the current DOS/Windows filesystem. This means you can’t play around with files or copy them because there may not be any files at all. It may allow users to copy records from one database to another through an intermediary server, at a cost. Microsoft has already said that all its own software has to be rewritten for Longhorn. So will everyone else’s. Thanks a lot.