![]() The classic use of portable applications is to run them off a USB thumb drive, but they work just as well running off the C disk. A portable program designed for Windows XP, for example, will run on any copy of Windows XP and from any disk drive letter, but the portability does not, in and of itself, imply that it will also work on Vista or Windows 2000. The name portable derives from the fact that the application can be run in any instance of it's supported operating system(s) without being formally installed. The simplest way, however, to get application isolation is to use portable applications. Here too, the idea is to isolate an application from the proverbial other kids in the sandbox that may not play well together. There is also software, such as Thinstall, to virtualize a single application rather than the entire operating system. Both are non-trivial steps to take, but when the application is important enough it makes sense. ![]() Another option, often used with servers, is to limit one computer to a single application. Virtualization software lets you run multiple operating systems concurrently on a single computer, so if need be a single machine can run multiple applications with no chance of their stepping on each others toes. For example, important applications can be run inside a virtual copy of the operating system and be the only software installed in that instance of the operating system. ![]() Getting to this ideal is one of the reasons for the popularity of virtualization. In a perfect world, each application would be isolated from other applications.
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