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List the configuration options available for updating the os

The HKEY_LOCAL_MACHINE (local machine-specific configuration data) and HKEY_CURRENT_USER (user-specific configuration data) nodes have a similar structure to each other; user applications typically look up their settings by first checking for them in "HKEY_CURRENT_USER\Software\Vendor's name\Application's name\Version\Setting name", and if the setting is not found, look instead in the same location under the HKEY_LOCAL_MACHINE key.

Registry values are non-container objects similar to files. Keys are referenced with a syntax similar to Windows' path names, using backslashes to indicate levels of hierarchy.

Keys must have a case insensitive name without backslashes.

Windows 95 and Windows NT extended its use to rationalise and centralise the information in the profusion of INI files, which held the configurations for individual programs, and were stored at various locations.

It is not a requirement for Windows applications to use the Windows Registry. NET Framework applications use XML files for configuration, while portable applications usually keep their configuration files with their executables. INI files stored each program's settings as a text file, often located in a shared location that did not provide user-specific settings in a multi-user scenario.

Different users, programs, services or remote systems may only see some parts of the hierarchy or distinct hierarchies from the same root keys.

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Registry values are name/data pairs stored within keys.The hierarchy of registry keys can only be accessed from a known root key handle (which is anonymous but whose effective value is a constant numeric handle) that is mapped to the content of a registry key preloaded by the kernel from a stored "hive", or to the content of a subkey within another root key, or mapped to a registered service or DLL that provides access to its contained subkeys and values. HKEY_LOCAL_MACHINE\Software\Microsoft\Windows refers to the subkey "Windows" of the subkey "Microsoft" of the subkey "Software" of the HKEY_LOCAL_MACHINE root key.There are seven predefined root keys, traditionally named according to their constant handles defined in the Win32 API, or by synonymous abbreviations (depending on applications): Like other files and services in Windows, all registry keys may be restricted by access control lists (ACLs), depending on user privileges, or on security tokens acquired by applications, or on system security policies enforced by the system (these restrictions may be predefined by the system itself, and configured by local system administrators or by domain administrators).The Windows Logo Program has specific requirements for where different types of user data may be stored, and that the concept of least privilege be followed so that administrator-level access is not required to use an application.The key located by HKLM is actually not stored on disk, but maintained in memory by the system kernel in order to map all the other subkeys. On Windows NT, this key contains four subkeys, "SAM", "SECURITY", "SYSTEM", and "SOFTWARE", that are loaded at boot time within their respective files located in the %System Root%\System32\config folder.For example, when a program is installed, a new subkey containing settings like a program's location, its version, and how to start the program, are all added to the Windows Registry.When introduced with Windows 3.1, the Windows Registry primarily stored configuration information for COM-based components.The registry is a hierarchical database that stores low-level settings for the Microsoft Windows operating system and for applications that opt to use the registry.The kernel, device drivers, services, Security Accounts Manager (SAM), and user interface can all use the registry.Backup and restoration is also simplified as the registry can be accessed over a network connection for remote management/support, including from scripts, using the standard set of APIs, as long as the Remote Registry service is running and firewall rules permit this.Because the registry is a database, it offers improved system integrity with features such as atomic updates.

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