Microsoft Windows Server 2003 Inside Out Chapter 14 (Web hosting control panel)
Microsoft Windows Server 2003 Inside Out Chapter 14 At the top of the Registry hierarchy are the root keys. Each root key contains several subkeys, which contain other subkeys and value entries. The names of value entries must be unique within the associated subkey, and the value entries correspond to specific configuration parameters. The settings of those configuration parameters are the values stored in the value entry. Each value has an associated data type that controls the type of data it can store. For example, some value entries are used to store only binary data, while others are used to store only strings of characters, and the value s data type controls this. We can now break down the Registry path HKEY_LOCAL_MACHINESOFTWARE MicrosoftWindows NTCurrentVersionWinlogonAllowMultipleTSSessions so that it is more meaningful. Here, HKEY_LOCAL_MACHINE is the root key. Each entry below the root key until we get to AllowMultipleTSSessions represents a subkey level within the Registry hierarchy. Finally, AllowMultipleTSSessions is the actual value entry. The Registry is very complex and it is often made more confusing because documentation on the subject uses a variety of different terms beyond those already discussed. When reading about the Registry in various sources, you might see references to the following: . Subtrees A subtree is a name for the tree of keys and values stemming from a root key down the Registry hierarchy. In documentation, you often see root keys referred to as subtrees. What the documentation means when it refers to a subtree is the branch of keys and values contained within a specified root key. . Keys Technically, root keys are the top of the Registry hierarchy, and everything below a root key is either a subkey or a value entry. In practice, subkeys are often referred to as keys. It s just easier to refer to such and such a key sort of like when we refer to such and such a folder rather than saying subfolder. . Values A value is the lowest level of the Registry hierarchy. For ease of reference, value entries are often simply referred to as values. Technically, however, a value entry comprises three parts: a name, a data type, and a value. The name identifies the configuration setting. The data type identifies the format for the data. The value is the actual data within the entry. Now that you know the basics of the Registry s structure, let s dig deeper, taking a closer look at the root keys, major subkeys, and data types. Registry Root Keys The Registry is organized into a hierarchy of keys, subkeys, and value entries. The root keys are at the top of the hierarchy and form the primary branches, or subtrees, of Registry information. There are two physical root keys, HKEY_LOCAL_MACHINE and HKEY_USER. These physical root keys are associated with actual files stored on the disk and are divided into additional logical groupings of Registry information. As shown in Table 14-1, the logical groupings are simply subsets of information gathered from HKEY_LOCAL_MACHINE and HKEY_USER. 414 Part 4: Managing Windows Server 2003 Systems
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