Microsoft Windows Server 2003 Inside Out Chapter 14
Microsoft Windows Server 2003 Inside Out Chapter 14 HKEY_CLASSES_ROOT HKEY_CLASSES_ROOT, abbreviated as HKCR, stores all file associations that tell the computer which document file types are associated with which applications, as well as which action to take for various tasks, such as open, edit, close, or play, based on a specified document type. For example, if you double-click a .doc file, the document typically is opened for editing in Microsoft Office Word. This file association is added to HKCR when you install Microsoft Office. If Microsoft Office isn t installed, a .doc file is opened instead in WordPad because of a default file association created when the operating system is installed. HKCR is built from HKEY_LOCAL_MACHINESOFTWAREClasses and HKEY_ CURRENT_USERSOFTWAREClasses. The former provides computer-specific class registration, and the latter, user-specific class registration. Because the user-specific class registrations have precedence, this allows for different class registrations for each user of the machine. This is different from previous versions of the Windows operating system for which the same class registration information was provided for all users of a particular machine. HKEY_CURRENT_CONFIG HKEY_CURRENT_CONFIG, abbreviated as HKCC, contains information about the hardware configuration with which you started the system, which is also referred to as the machine s boot configuration. This key contains information about the current device assignments, device drivers, and system services that were present at boot time. HKCC is built from HKEY_LOCAL_MACHINE SYSTEMCurrentControlSetHardware ProfilesCurrent, which in turn is a pointer to a numbered subkey that contains the current hardware profile. If a system has multiple hardware profiles, the key points to a different hardware profile, depending on the boot state or the hardware profile selection made at startup. For example, portable computers typically have docked and undocked hardware profiles. If a portable computer were started using the docked profile, it would use one hardware configuration, and if it were started using the undocked profile, it would use another hardware configuration. HKEY_CURRENT_USER HKEY_CURRENT_USER, abbreviated as HKCU, contains information about the user currently logged on. This key has a pointer to HKEY_USERUserSID, where UserSID is the security identifier for the current user as well as for the default profile discussed previously. Microsoft requires that applications store user- specific preferences under this key. For example, Microsoft Office settings for individual users are stored under this key. Additionally, as discussed previously, HKEY_CURRENT_USERSOFTWAREClasses stores the user-specific settings for file associations. 422 Part 4: Managing Windows Server 2003 Systems
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