Registry Settings

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    Our updatedTerms of Usewill become effective on May 25, 2012.Find out more.

    Windows Registry

    From Wikipedia, the free encyclopediaThis article'slead sectionmay not adequatelysummarizeits contents. Please

    consider expanding the lead toprovide an accessible overviewof the article's key

    points. (March 2012)

    The Windows Registry is a hierarchicaldatabasethat stores configuration settings and options onMicrosoft

    Windowsoperating systems. It contains settings for low-level operating system components as well as the

    applications running on the platform: thekernel,device drivers,services,SAM,user interfaceand third party

    applications all make use of the registry. The registry also provides a means to accesscountersfor profiling

    system performance.

    When first introduced withWindows 3.1, the Windows registry's primary purpose was to store configuration

    information forCOM-based components. With the introduction of Windows 95 and Windows NT, its use was

    extended to tidy up the profusion of per-programINI filesthat had previously been used to store configuration

    settings for Windows programs.[1][2]

    Portable applicationsusually do not write configuration data in the Windows

    Registry, but instead keep the configuration data within files inside a single directory where the application is

    run.

    Contents

    [hide]

    1 Rationale

    2 Structure

    o 2.1 Keys and values

    o 2.2 Hives

    2.2.1 HKEY_LOCAL_MACHINE (HKLM)

    2.2.2HKEY_CURRENT_CONFIG (HKCC)

    2.2.3 HKEY_CLASSES_ROOT (HKCR)

    2.2.4 HKEY_USERS (HKU)

    2.2.5 HKEY_CURRENT_USER (HKCU)

    2.2.6 HKEY_PERFORMANCE_DATA

    2.2.7 HKEY_DYN_DATA

    3 Editing

    o 3.1 Manual editing

    http://wikimediafoundation.org/wiki/Terms_of_Use%20(2012)/en?utm_source=TOU_top_TestClone2http://wikimediafoundation.org/wiki/Terms_of_Use%20(2012)/en?utm_source=TOU_top_TestClone2http://wikimediafoundation.org/wiki/Terms_of_Use%20(2012)/en?utm_source=TOU_top_TestClone2http://wikimediafoundation.org/wiki/New%20Terms%20of%20use/en?utm_source=TOU_top_TestClone2http://wikimediafoundation.org/wiki/New%20Terms%20of%20use/en?utm_source=TOU_top_TestClone2http://wikimediafoundation.org/wiki/New%20Terms%20of%20use/en?utm_source=TOU_top_TestClone2http://en.wikipedia.org/wiki/Wikipedia:Lead_sectionhttp://en.wikipedia.org/wiki/Wikipedia:Lead_sectionhttp://en.wikipedia.org/wiki/Wikipedia:Lead_sectionhttp://en.wikipedia.org/wiki/Wikipedia:Summary_stylehttp://en.wikipedia.org/wiki/Wikipedia:Summary_stylehttp://en.wikipedia.org/wiki/Wikipedia:Summary_stylehttp://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style/Lead_section#Provide_an_accessible_overviewhttp://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style/Lead_section#Provide_an_accessible_overviewhttp://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style/Lead_section#Provide_an_accessible_overviewhttp://en.wikipedia.org/wiki/Directory_(database)http://en.wikipedia.org/wiki/Directory_(database)http://en.wikipedia.org/wiki/Directory_(database)http://en.wikipedia.org/wiki/Microsoft_Windowshttp://en.wikipedia.org/wiki/Microsoft_Windowshttp://en.wikipedia.org/wiki/Microsoft_Windowshttp://en.wikipedia.org/wiki/Operating_systemhttp://en.wikipedia.org/wiki/Operating_systemhttp://en.wikipedia.org/wiki/Operating_systemhttp://en.wikipedia.org/wiki/Kernel_(computing)http://en.wikipedia.org/wiki/Kernel_(computing)http://en.wikipedia.org/wiki/Kernel_(computing)http://en.wikipedia.org/wiki/Device_driverhttp://en.wikipedia.org/wiki/Device_driverhttp://en.wikipedia.org/wiki/Device_driverhttp://en.wikipedia.org/wiki/Windows_servicehttp://en.wikipedia.org/wiki/Windows_servicehttp://en.wikipedia.org/wiki/Windows_servicehttp://en.wikipedia.org/wiki/Security_Accounts_Managerhttp://en.wikipedia.org/wiki/Security_Accounts_Managerhttp://en.wikipedia.org/wiki/Security_Accounts_Managerhttp://en.wikipedia.org/wiki/Graphical_user_interfacehttp://en.wikipedia.org/wiki/Graphical_user_interfacehttp://en.wikipedia.org/wiki/Graphical_user_interfacehttp://en.wikipedia.org/wiki/Instrumentation_(computer_programming)http://en.wikipedia.org/wiki/Instrumentation_(computer_programming)http://en.wikipedia.org/wiki/Instrumentation_(computer_programming)http://en.wikipedia.org/wiki/Windows_3.1http://en.wikipedia.org/wiki/Windows_3.1http://en.wikipedia.org/wiki/Windows_3.1http://en.wikipedia.org/wiki/Component_Object_Modelhttp://en.wikipedia.org/wiki/Component_Object_Modelhttp://en.wikipedia.org/wiki/Component_Object_Modelhttp://en.wikipedia.org/wiki/INI_filehttp://en.wikipedia.org/wiki/INI_filehttp://en.wikipedia.org/wiki/INI_filehttp://en.wikipedia.org/wiki/Windows_Registry#cite_note-Reghist-0http://en.wikipedia.org/wiki/Windows_Registry#cite_note-Reghist-0http://en.wikipedia.org/wiki/Portable_applicationhttp://en.wikipedia.org/wiki/Portable_applicationhttp://en.wikipedia.org/wiki/Portable_applicationhttp://en.wikipedia.org/wiki/Windows_Registryhttp://en.wikipedia.org/wiki/Windows_Registryhttp://en.wikipedia.org/wiki/Windows_Registryhttp://en.wikipedia.org/wiki/Windows_Registry#Rationalehttp://en.wikipedia.org/wiki/Windows_Registry#Rationalehttp://en.wikipedia.org/wiki/Windows_Registry#Structurehttp://en.wikipedia.org/wiki/Windows_Registry#Structurehttp://en.wikipedia.org/wiki/Windows_Registry#Keys_and_valueshttp://en.wikipedia.org/wiki/Windows_Registry#Keys_and_valueshttp://en.wikipedia.org/wiki/Windows_Registry#Hiveshttp://en.wikipedia.org/wiki/Windows_Registry#Hiveshttp://en.wikipedia.org/wiki/Windows_Registry#HKEY_LOCAL_MACHINE_.28HKLM.29http://en.wikipedia.org/wiki/Windows_Registry#HKEY_LOCAL_MACHINE_.28HKLM.29http://en.wikipedia.org/wiki/Windows_Registry#HKEY_CURRENT_CONFIG_.28HKCC.29http://en.wikipedia.org/wiki/Windows_Registry#HKEY_CURRENT_CONFIG_.28HKCC.29http://en.wikipedia.org/wiki/Windows_Registry#HKEY_CURRENT_CONFIG_.28HKCC.29http://en.wikipedia.org/wiki/Windows_Registry#HKEY_CLASSES_ROOT_.28HKCR.29http://en.wikipedia.org/wiki/Windows_Registry#HKEY_CLASSES_ROOT_.28HKCR.29http://en.wikipedia.org/wiki/Windows_Registry#HKEY_USERS_.28HKU.29http://en.wikipedia.org/wiki/Windows_Registry#HKEY_USERS_.28HKU.29http://en.wikipedia.org/wiki/Windows_Registry#HKEY_CURRENT_USER_.28HKCU.29http://en.wikipedia.org/wiki/Windows_Registry#HKEY_CURRENT_USER_.28HKCU.29http://en.wikipedia.org/wiki/Windows_Registry#HKEY_PERFORMANCE_DATAhttp://en.wikipedia.org/wiki/Windows_Registry#HKEY_PERFORMANCE_DATAhttp://en.wikipedia.org/wiki/Windows_Registry#HKEY_DYN_DATAhttp://en.wikipedia.org/wiki/Windows_Registry#HKEY_DYN_DATAhttp://en.wikipedia.org/wiki/Windows_Registry#Editinghttp://en.wikipedia.org/wiki/Windows_Registry#Editinghttp://en.wikipedia.org/wiki/Windows_Registry#Manual_editinghttp://en.wikipedia.org/wiki/Windows_Registry#Manual_editinghttp://en.wikipedia.org/wiki/Windows_Registry#Manual_editinghttp://en.wikipedia.org/wiki/Windows_Registry#Editinghttp://en.wikipedia.org/wiki/Windows_Registry#HKEY_DYN_DATAhttp://en.wikipedia.org/wiki/Windows_Registry#HKEY_PERFORMANCE_DATAhttp://en.wikipedia.org/wiki/Windows_Registry#HKEY_CURRENT_USER_.28HKCU.29http://en.wikipedia.org/wiki/Windows_Registry#HKEY_USERS_.28HKU.29http://en.wikipedia.org/wiki/Windows_Registry#HKEY_CLASSES_ROOT_.28HKCR.29http://en.wikipedia.org/wiki/Windows_Registry#HKEY_CURRENT_CONFIG_.28HKCC.29http://en.wikipedia.org/wiki/Windows_Registry#HKEY_LOCAL_MACHINE_.28HKLM.29http://en.wikipedia.org/wiki/Windows_Registry#Hiveshttp://en.wikipedia.org/wiki/Windows_Registry#Keys_and_valueshttp://en.wikipedia.org/wiki/Windows_Registry#Structurehttp://en.wikipedia.org/wiki/Windows_Registry#Rationalehttp://en.wikipedia.org/wiki/Windows_Registryhttp://en.wikipedia.org/wiki/Portable_applicationhttp://en.wikipedia.org/wiki/Windows_Registry#cite_note-Reghist-0http://en.wikipedia.org/wiki/Windows_Registry#cite_note-Reghist-0http://en.wikipedia.org/wiki/INI_filehttp://en.wikipedia.org/wiki/Component_Object_Modelhttp://en.wikipedia.org/wiki/Windows_3.1http://en.wikipedia.org/wiki/Instrumentation_(computer_programming)http://en.wikipedia.org/wiki/Graphical_user_interfacehttp://en.wikipedia.org/wiki/Security_Accounts_Managerhttp://en.wikipedia.org/wiki/Windows_servicehttp://en.wikipedia.org/wiki/Device_driverhttp://en.wikipedia.org/wiki/Kernel_(computing)http://en.wikipedia.org/wiki/Operating_systemhttp://en.wikipedia.org/wiki/Microsoft_Windowshttp://en.wikipedia.org/wiki/Microsoft_Windowshttp://en.wikipedia.org/wiki/Directory_(database)http://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style/Lead_section#Provide_an_accessible_overviewhttp://en.wikipedia.org/wiki/Wikipedia:Summary_stylehttp://en.wikipedia.org/wiki/Wikipedia:Lead_sectionhttp://wikimediafoundation.org/wiki/New%20Terms%20of%20use/en?utm_source=TOU_top_TestClone2http://wikimediafoundation.org/wiki/Terms_of_Use%20(2012)/en?utm_source=TOU_top_TestClone2
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    o 3.2 .REG files

    o 3.3 Command line editing

    o 3.4 Programs or scripts

    o 3.5 COM self-registration

    o 3.6 Advanced functionality

    4 Locations

    o 4.1 Windows NT-based operating systems

    o 4.2 Windows 95, 98, and Me

    o 4.3 Windows 3.11

    5 Backups and recovery

    6 Policy

    o 6.1 Group policy

    o 6.2 Legacy systems

    7 .INI file virtualization

    8 Registry virtualization

    9 Criticism

    10 Equivalents in other operating systems

    11 See also

    12 Notes

    13 Footnotes

    14 References

    15 External links

    [edit]Rationale

    Prior to the Registry,.INI filesstored each program's settings into a text file, often located in a shared location

    that did not allow for user-specific settings in a multi-user scenario. By contrast, the Windows registry stores all

    application settings in one logical repository (but a number of discrete files) and in a standardized form.

    According to Microsoft this offers seve

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