Description
Modern operating systems such a Microsoft Windows and Linux can include limited application virtualization. For example, INI file mappings were introduced with Windows NT to virtualize, into the registry, the legacy INI files of applications originally written for Windows 3.1. Similarly, Windows Vista implements a shim that applies limited file and registry virtualization so that legacy applications that try to save user data in a read-only system location that was writable by anyone in early Windows, can still work.
Full application virtualization requires a virtualization layer. Application virtualization layers replace part of the runtime environment normally provided by the operating system. The layer intercepts all file and Registry operations of virtualized applications and transparently redirects them to a virtualized location, often a single file. The application remains unaware that it accesses a virtual resource instead of a physical one. Since the application is now working with one file instead of many files and registry entries spread throughout the system, it becomes easy to run the application on a different computer and previously incompatible applications can be run side-by-side. Examples of this technology for the Windows platform include AppZero, BoxedApp, Cameyo, Ceedo, Evalaze, InstallFree, Citrix XenApp, Novell ZENworks Application Virtualization, Endeavors Technologies Application Jukebox, Microsoft Application Virtualization, Software Virtualization Solution, Spoon (former Xenocode), VMware ThinApp and P-apps.
Read more about this topic: Application Virtualization
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