Windows Registry is the database used to store configurations, settings and options for Microsoft Windows systems. The database has a hierarchical structure.

The registry contains set-up for components of low-level operating systems and the applications based on that platform. Registry is used by device drivers, the kernels, SAM, user interface, services and all the third party software.

The Windows Registry also enables to access counter which helps in analyzing the performance of system.

The Windows Registry was first launched in the market with Windows 3.1 to store important configuration information for COM-based components.

The use of registry was inflated with the launch of Windows 95 and Windows NT so as to organize the surplus of INI files per program, which had been used earlier to amass settings of configuration for Windows programs.

The Registry includes two basic elements values and keys.

Inside keys, Registry Values are stored and they actually represent name/data pairs.

The Windows API functions, querying and manipulating values of registry, get value names in a different way from the key path. They may also use handle which identify the parent key.

The terminology seems to be misleading because the values resemble to an associative array. This associative array uses standard terminology for referring the name part of the value as a key.

The terminologies are a proffer from the 16-bit registry of Windows 3, wherein keys did not possess arbitrary pairs of name/data, but instead had just a single unnamed value that essentially needed to be a string.

The biggest advantage of Registry in Microsoft Windows is that it can be edited manually with the help of regedit.exe or regedt32.exe in the Windows directory.

Although, neglectfully editing the registry can result in irreparable damage or you end up with a slow Vista. Therefore, Microsoft and several industry experts, including the writers and editors of leading trade magazines, have highly recommended to perform backups of the registry prior to editing it.

A straightforward implementation of the present-day registry tool surfaced in Windows 3.x operating system, dubbed as “Registration Info Editor” or simply “Registration Editor”.

It was mainly only an applications database that facilitates editing embedded OLE objects.

Here is the test of alertness as there are a lot of distinctions between the two editors available on these operating systems.

Microsoft Windows XP was the first system in which both the programs were integrated into one. This integrated program contained the interface of REGEDIT.EXE and the functionality of REGEDT32.EXE.

However, the distinctions do not occur with Windows XP as well as the newer versions REGEDIT.EXE being the improved editor and REGEDT32.EXE being purely a stub invoking REGEDIT.EXE.

Following functions can be performed using the Registry Editor:

• Loading, manipulating and unloading registry hive format files (Windows NT-based systems only)
• Setting permissions based on ACLs (Windows NT-based systems only)
• Bookmarking user-selected registry keys as Favorites
• Finding particular strings in key names, value names and value data
• Remotely editing the registry on another networked computer

Linux platform too allows for editing the registry with the assistance of an open source tool called Offline NT Password & Registry Editor.

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