Today we are discuss Registry information of windows platform.This is the important part of our windows operating system.Every windows program dependent of registry settings. So, improve our idea…………………..
The Registry is the central conﬁguration database where Windows stores and retrieves startup settings, hardware and software conﬁguration information, and information for local user accounts. Logically, the Registry is divided into ﬁve sections called subtrees; each subtree is further divided into keys that contain individual data items called value entries. The Registry is stored on the disk as a group of ﬁles.
Editing the Registry
You can view and edit the contents of the Registry directly using the Registry Editor tool, regedit.exe. However, most changes to the Registry are made automatically by the system, by hardware devices, and by applications. It is rarely necessary to edit the Registry directly. If you ever need to do so, use extreme caution and back up the Registry ﬁles ﬁrst, because incorrect changes can cause irrecoverable problems with Windows.
Windows 2000 offered an alternate version of the Registry Editor, regedt32.exe, that had a slightly different user interface. On Windows XP and the recent versions of Windows, if you enter the regedt32.exe command, regedit.exe will launch.
The Registry consists of ﬁve ﬁles stored in the \Windows\System32\Conﬁg folder: Default, SAM, Security, Software, and System. Plus, there is a Registry ﬁle named Ntuser.dat, which is unique for each user who logs on to the computer. This ﬁle is stored in each user’s proﬁle folder.
The Registry consists of ﬁve subtrees, sometimes also called “hives.” Some of the subtrees are temporary pointers to information stored permanently in another Registry location. The following table lists and describes the subtrees.
All the ﬁle association information. Windows uses this information to determine which application it should open whenever you double-click a ﬁle with a speciﬁc extension. For example, Windows automatically opens Notepad whenever you double-click ﬁle with the extension .txt.
The user-speciﬁc conﬁguration information for the user currently logged on to the computer. For example, information about the user’s selected color scheme and wallpaper is stored in this subtree.
All the conﬁguration information for the computer’s hardware. For example, this subtree contains information about any modems installed in the computer, any deﬁned hardware proﬁles, and the networking conﬁguration.
User-speciﬁc conﬁguration information for all users who have ever logged on at the computer.
Information about the current conﬁguration of the computer’s hardware. Windows operating systems support Plug and Play (PnP), a set of industry-standard device speciﬁcations, originally developed by Intel Corporation, which enables computers to automatically detect and install various types of devices without user intervention.
Registry Value Entries
An individual Registry value entry consists of a name, a data type, and the actual data stored in the value. The data types can be various types of alphanumeric strings, binary data, or hexadecimal data.
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