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InWindows Shell programming, theWindows Shell namespace is an organized tree-structuredhierarchical representation thatWindows Explorer facilitates to graphically presentfile system contents and other objects to the end user. Conceptually, the Shell namespace may be regarded as a larger and more inclusive version of the file system.
The Shell namespace is a hierarchical tree that consists of the wide variety of objects that make up the system.
Specifically, the Shell namespace consists of two basic types of objects, namely files and folders. Folder objects, which are containers for file objects and other folders called subdirectories, are the nodes of the tree, while file objects are the leaves of the namespace tree. Objects in the Shell namespace can represent physically stored file system objects such as files and folders, or can be virtual objects such as theMy Network Places andRecycle Bin "virtual folders".
The folders and data files that reside on physical computer disk drives are the most numerous and familiar of these objects; although, throughextensions the Shell also provides access to various virtual objects that may not involve physical storage at all. Consequentially, there are folders that do not reside on the physical file system, which are referred to asvirtual folders. Likewise, there are virtual file objects that do not reside on the physical file system. Virtual Shell objects are used throughout the Windows Shell. On theDesktop, Shell launchers are implemented through a built-inshell extension. The Windows Shell utilizes virtual Shell objects to conceptually represent computerperipherals and network devices, such as printers and routers. Virtual Shell objects can function asShell links and execute commands when invoked by the user. For example, in Windows XP and other versions,"rundll32.exe" shell32.dll,Options_RunDLL 0 is executed on the command line when a user launches the "Folder Options"applet in the Control Panel.
Theuser's Desktop is aspecial folder that resides at the root of the Shell namespace. Although this folder maps by default to a physical folder stored in the user's profile folder, the special desktop folder is represented as a distinct object from the physical desktop folder. The same holds true with the "My Documents" (Windows 95 through XP) or user "Documents" (Windows Vista+) folder.
