5가지 레지스트리 루트키 / The 5 Registry Root Keys of The Windows Registry

The 5 Registry Root Keys of The Windows Registry:

 

 

내 PC의 레지스트리 구조

1. HKEY_CLASSES_ROOT (HKCR)

The HKEY_CLASSES_ROOT, abbreviated as HKCR is a registry root key, whose hive has all the information of the file name extensions and OLE (Object Linking and Embedding). There are thousands of keys within this hive. All of these are for sake of understanding classified into these classes:

• Each key is a file name extension with the information about the default program with which files of that format are accessed. You can modify the program that is set as default here. But owing to all the complexity this process carries, we recommend not doing so. Also the OLE technology helps in linking and embedding objects and programs. But the complexity involved is definitely a bottleneck though.
• The remaining keys in this hive are ProgID, CLSID and IID. These keys are related to technical aspects of programming and will be discussed later on.

2. HKEY_CURRENT_USER (HKCU)

This registry root key contains all the settings related to the user who is currently logged into the computer. Right from the appearance aspect to how the mouse pointer behaves, everything can be controlled via this hive. Usually in most of the Windows operating systems all these settings are available in the following keys:

• Console Key
• Control Panel Key
• Environment Key
• Network Key
• Software Subtree

(Source: technet.microsoft.com)

3. HKEY_LOCAL_MACHINE (HKLM)

This is one of the most accessed registry hives. This registry root key contains all the information about the hardware and software of the system. It includes the bus system used, the hard drive technology, the operating system details and everything else about your computer.

 

This entire information is not a part of the hard drive but is stored in the system memory, mapping all the sub keys. There actually can be in depth discussion of the science of the HKLM but is out of scope of this article.

 

4. HKEY_USERS (HKU)

In this registry is the information on settings made by various users on the computers, many a time the values represented by the HKU and HKCU are similar. For better understanding, we can interpret it to be a superset of the HKEY_CURRENT_USER registry root keys.

 

5. HKEY_CURRENT_CONFIGURATION (HKCC)

The HKCC is the registry root key which contains information about the hardware which is currently used by the computer. It is most often empty and gets activated at boot time, during which it loads the ‘hardware profiles’ sub key of the HKLM.

These are the registry root keys being used in the Windows 8’s registry. Some other additional root keys like the HKEY_DYN_DATA (HKDD) used to be present in the earlier versions of Windows.

 

 

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• HKEY_CLASSES_ROOT(HKCR) : 파일 연결, OLE 객체 클래스 ID와 같은 등록된 응용 프로그램의 정보 저장
• HKEY_CURRENT_USER(HKCU) : 현재 로그인한 사용자의 설정 정보 저장
• HKEY_LOCAL_MACHINE(HKLM) : 컴퓨터의 모든 사용자 설정 저장
• HKEY_USERS(HKU) : 컴퓨터에서 사용 중인 각 사용자 프로파일에 대한 HKEY_CURRENT_USER 키에 일치하는 서브키 저장
• HKEY_CURRENT_CONFIG(HKCC) : 실행 시간에 수집한 자료 저장