Idea of Registry – Microsoft Windows …!!!

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Hello Everybody,

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.

The Registry

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.

Registry Files

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.

Registry Subtrees

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.

1) HKEY_CLASSES_ROOT

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.

2) HKEY_CURRENT_USER

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.

3) HKEY_LOCAL_MACHINE

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.

4) HKEY_USERS

User-specific configuration information for all users who have ever logged on at the computer.

5) HKEY_CURRENT_CONFIG

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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