Libraries are virtual containers for users' content. A library can contain files and folders stored on the local computer or in a remote storage location. In Windows Explorer, users interact with libraries in ways similar to how they would interact with other folders. Libraries are built upon the legacy known folders (such as My Documents, My Pictures, and My Music) that users are familiar with, and these known folders are automatically included in the default libraries and set as the default save location.
Including a folder in a library doesn't physically move or change the storage location of the files or folders; the library is a view into those folders. However, users interacting with files in a library are copying, moving, and deleting the files themselves, not copies of these files.
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Libraries are built upon the legacy known folders (such as My Documents, My Pictures, and My Music) that users are familiar with. These known folders are automatically included in the default libraries and set as the default save location. That is, when users drag, copy, or save a file to the Documents library, the file is moved, copied, or saved to the My Documents folder. Administrators and users can change the default save-to location.
Users or administrators can hide or delete the default libraries, though the libraries node in the Navigation pane can't be hidden or deleted. Hiding a default library is preferable to deleting it, as applications like Windows Media Player rely on the default libraries and re-create them if they don't exist on the computer. See How to Hide Default Libraries for instructions.
Each library has a default save location. Files are saved or copied to this location if the user chooses to save or copy a file to a library, rather than a specific location within the library. Known folders are the default save locations; however, users can select a different save location.If the user removes the default save location from a library, the next location is automatically selected as the new default save location. If the library is empty of locations or if all included locations can't be saved to, then the save operation fails.
Certain library features depend on the contents of the libraries being indexed. Library locations must be available for local indexing or be indexed in a manner conforming to the Windows Indexing Protocol. If indexing isn't enabled for one or more locations within a library, the entire library reverts to basic functionality:
To avoid this limited functionality, all locations within the library must be indexable, either locally or remotely. When users add local folders to libraries, Windows adds the location to the indexing scope and indexes the contents. Remote locations that aren't indexed remotely can be added to the local index using Offline File synchronization. This feature gives the user the benefits of local storage even though the location is remote. Making a folder "Always available offline" creates a local copy of the folder's files, adds those files to the index, and keeps the local and remote copies in sync. Users can manually sync locations that aren't indexed remotely and aren't using folder redirection to gain the benefits of being indexed locally.
If your environment doesn't support caching files locally, you should enable the Turn off Windows Libraries features that rely on indexed file data Group Policy. This enablement makes all libraries basic. For more information, see Group Policy for Windows Search, Browse, and Organize.
While library files themselves can't be redirected, you can redirect known folders included in libraries by using Folder Redirection. For example, you can redirect the "My Documents" folder, which is included in the default Documents library. When redirecting known folders, you should make sure that the destination is either indexed or always available offline in order to maintain full library functionality. In both cases, the files for the destination folder are indexed and supported in libraries. These settings are configured on the server side.
* For shares that are indexed on a departmental server, Windows Search works well in a workgroup or on a domain server that has similar characteristics to a workgroup server. For example, Windows Search works well on a single share departmental server with the following characteristics:
The library icon can be modified by the administrator or user by directly editing the Library Description schema file. See Library Description Schema for information on creating Library Description files.
The Microsoft Windows operating system supports a form of shared libraries known as "dynamic-link libraries", which are code libraries that can be used by multiple processes while only one copy is loaded into memory. This article provides an overview of the core libraries that are included with every modern Windows installation, on top of which most Windows applications are built.
The Windows Hardware Abstraction Layer (HAL) is implemented in hal.dll.[1] The HAL implements a number of functions that are implemented in different ways by different hardware platforms, which in this context, refers mostly to the chipset. Other components in the operating system can then call these functions in the same way on all platforms, without regard for the actual implementation.
For example, responding to an interrupt is quite different on a machine with an Advanced Programmable Interrupt Controller (APIC) than on one without. The HAL provides a single function for this purpose that works with all kinds of interrupts by various chipsets, so that other components need not be concerned with the differences.
The HAL is loaded into kernel address space and runs in kernel mode, so routines in the HAL cannot be called directly by applications, and no user mode APIs correspond directly to HAL routines. Instead, the HAL provides services primarily to the Windows executive and kernel and to kernel mode device drivers. Although drivers for most hardware are contained in other files, commonly of file type .sys, a few core drivers are compiled into hal.dll.
Kernel mode device drivers for devices on buses such as PCI and PCI Express directly call routines in the HAL to access I/O ports and registers of their devices. The drivers use HAL routines because different platforms may require different implementations of these operations. The HAL implements the operations appropriately for each platform, so the same driver executable file can be used on all platforms using the same CPU architecture, and the driver source file can be portable across all architectures.
On x86 systems prior to Windows 8, there are several different HAL files on the installation media. The Windows installation procedure determines which ones are appropriate for the current platform and copies it to the hard drive, renaming it to hal.dll if necessary. Among the criteria for this selection are: the presence of an ACPI-compatible BIOS, the presence of an APIC, and whether or not multiple processors are present and enabled. (The multiple cores of a multi-core CPU, and even the "logical processors" implemented by a hyperthreading CPU, all count as "processors" for this purpose.) On x86-64 and Itanium platforms there is just one possible hal.dll for each CPU architecture. On Windows 8 and later, the x86 version also only has one HAL.
NTDLL.DLL exports the Windows Native API. The Native API is the interface used by user-mode components of the operating system that must run without support from Win32 or other API subsystems. Most of this API is implemented in NTDLL.DLL and at the upper edge of ntoskrnl.exe (and its variants), and the majority of exported symbols within these libraries are prefixed Nt, for example NtDisplayString. Native APIs are also used to implement many of the "kernel APIs" or "base APIs" exported by KERNEL32.DLL.[3][4][5] The large majority of Windows applications do not call NTDLL.DLL directly.[6]
Applications that are linked directly against this library are said to use the native subsystem; the primary reason for their existence is to perform tasks that must run early in the system startup sequence before the Win32 subsystem is available. An obvious but important example is the creation of the Win32 subsystem process, csrss.exe. Before the csrss.exe process exists, no Win32 processes may be created, therefore the process that creates it (Smss.exe, the "session manager") must use the native subsystem. csrss.exe itself is such an application.
Despite having an ".exe" file extension, native applications cannot be executed by the user (or any program in the Win32 or other subsystems). An example is the autochk.exe binary that runs chkdsk during the system initialization "Blue Screen". Other prominent examples are the services that implement the various subsystems, such as csrss.exe.
Though most of the API is undocumented, Native Applications can be built using the Windows Driver Development Kit; many antivirus software and other utility software vendors incorporate Native Applications within their products, usually to perform some boot-time task that cannot be carried out in userspace.[citation needed]
KERNEL32.DLL exposes to applications most of the Win32 base APIs, such as memory management, input/output (I/O) operations, process and thread creation, and synchronization functions. Many of these are implemented within KERNEL32.DLL by calling corresponding functions in the native API, exposed by NTDLL.DLL.[8][failed verification]
GDI32.DLL exports Graphics Device Interface (GDI) functions that perform primitive drawing functions for output to video displays and printers. It is used, for example, in the XP version of Paint. Applications call GDI functions directly to perform low-level drawing (line, rectangle, ellipse), text output, font management, and similar functions.[8][9]
Initially, GDI supported 16 and 256 color EGA/VGA display cards and monochrome printers. The functionality has expanded over the years, and now includes support for things like TrueType fonts, alpha channels, and multiple monitors.[10] 152ee80cbc
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