In a way, Longhorn can be thought of as the Mr Potato Head of operating systems: Around 95 percent of the key functions of the OS will exist in a basic software core. To make a Longhorn PC for export to France, for instance, PC makers will bolt the French language module onto the basic Longhorn core through the Multi-Lingual User Interface (MUI), a new subsystem within the operating system. Similarly, manufacturers will take the Longhorn core and add select modules to tailor it for a Tablet PC, for example, or a Media Centre PC destined for the Philippines. This process will be managed through the Component Management Interface (CMI), a new feature which can be used to upgrade the OS over its functional life. CMI will function like the add/remove applications function in the control panel of PCs today, according to Microsoft. Likewise, people will also be able to flip a given computer from English to another language fairly easily. Apple already uses modularity on its Mac OS X operating system to make it easier and cheaper to localise the OS for different languages; Microsoft has also introduced some MUI functionality with Windows XP, although localisation, the process of translating the software to accommodate a foreign language, is still the norm. With Longhorn, Microsoft will attempt to make modularity more useful and profitable for the company. Part of the reason for the move to a modular Windows is the growing number of Windows versions. Microsoft sells four different versions of Windows XP for PCs -- Windows XP Home, Windows XP Professional, Tablet PC and Windows XP Media Centre -- with additional versions for embedded devices and 64-bit workstations. In turn, each of these is localised into several European and Asian languages. The specialisation process then continues at the computer manufacturer's factory. The software bundle, or image, put on each PC varies model by model: A Dell Dimension 4600 has a different image than does a Dimension 4550, which means that from a manufacturing perspective, the version of Windows is different. Additionally, PC makers and some corporate buyers also customise the image on top of that for branding or other purposes, further expanding the number of images. All of these tweaks mean that PC makers, in the end, are juggling a wide spectrum of different versions of Windows. Longhorn will allow the same core image to be used on a wider variety of PC models or family. Modularity could "eliminate hardware dependencies," said Jeff Ford, manager of software development in IBM's personal client division. "A 15 minute load, that is the goal," Myers said, adding that the process of transferring a client software image onto a PC can take substantially longer today. The quicker the load, the more PCs can come off the factory line in a single day, which in turn leads to cheaper PCs. Ideally, capital spending for OEMs could be spread out, too. "The more and more we can increase velocity in the factory, the fewer factories that have to be built," Myers said. Issuing bug patches will also be easier. "Ninety five percent of the bugs will hit the single international core," he added. "One service pack for those bugs will work on all operating systems." Longhorn is still a way off, and the tools for loading operating systems in a modular fashion are still being created. "We haven't had time to evaluate it yet," said Ford. Language switching could also create problems, he added. If someone switches the OS from English to German, the applications might still be in English. Also, keyboards vary by geography. Still, the concept holds promise, especially since there is now a wider variety of Windows. An interim tool, called WinPE (Windows Preinstallation Environment) for Windows XP, will introduce to manufacturers the concepts intended to debut with Longhorn. "You're looking at five different versions of Windows that you are going to have to manage in the manufacturing area," said Mike Cherry, an analyst at Directions on Microsoft. "It is kind of interesting and sort of extends the work done by the guys doing Windows XP Embedded" who are already shoehorning Windows XP into a panoply of different computers, Cherry added.
Is Linux really a viable alternative to Windows on the desktop? Read the latest headlines at ZDNet UK's Operating Systems News Section.
Let the editors know what you think in the Mailroom.
