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Windows system registry is a database containing the settings of the operating system (hardware, software, users). When system parameters of the operating system are changed, the system registry is updated.
The registry can be edited by You can edit the registry using the regedit.exe program utility included in the standard set of service programs in Windows. The information about the OS settings is stored in two hidden files in a the Windows folderdirectory: system.dat and user.dat. The registry is a hierarchical tree structure, the branches of which constitute the keys that contain values or parameters and subkeys. The registry has six main branches described in the table.
Branch name | Description |
HKEY_CLASSES_ROOT | Contains the information of about the software configuration, including the ties of the links from file extensions types to programscertain applications, drag-and-drop parameters, printer settings parameters and COM port settings. |
HKEY_CURRENT_USER | Contains user system configuration settings of the system. This section is created and populated with information from the HKEY_USERS section upon user logon.login |
HKEY_LOCAL_MACHINE | Contains the parameters of the computer, its drivers and other hardware. The data information in this section is shared by common to all users of the computer. |
HKEY_USERS | Contains the information about all users registered who have accounts on the this computer. There are Contains two types of parameters – shared by : common to all users , and specific to each user. |
HKEY_CURRENT_CONFIG | Contains the information about the current hardware configuration. |
HKEY_DYN_DATA | Points to a subsection in the HKEYIndicates the part of the HKEY_LOCAL_MACHINE section related to Plug and that is needed for Plug & Play devices. This section changes upon adding or removing devices to or from the computer.when you add or remove devices from the system |
The branches, keys and subkeys are The branch structure is visually similar to the structure of the user folders, allowing nested branches. Figure The figure shows the main elements of the registry.
- Branches;
- Keys;
- Subkeys;
- Parameters;
- Branch.
- Key.
- Subkey.
- Parameter.
A Each parameter has three componentscharacteristics: name, data type and value. A key can have only one parameter with no name, which serves as a default value of for the key. It is recommended to assign meaningful names to parametersgive the parameter of the registry key a meaningful name, indicating its purpose.
The values in the registry can be of particular Windows has a set of registry data types. The most commonly used types are described in the table.
Data type | Description | Purpose |
REG_DWORD | A parameter of this type takes 4 bytes and is displayed in hexadecimal or and decimal format. | Many service or driver parameters are of this type. Example: 0x00000240(576) — decimal value of the parameter is given in parenthesis. |
REG_BINARY | Binary data of in an arbitrary form. Maximum length – of the parameter of this type is 16 bytes. | Most data information on hardware components is stored as binary . In the regedit.exe window it is displayed in data and displayed in the registry editor in the hexadecimal format, for example "01 00 00 00." |
REG_SZ | A string ending with a null symbol.character | Example: "C:\Windows" |
REG_MULTI_SZ | Multi-line Multiline text. An array of strings ending with a null each. An array itself ends with two nulls.null characters | This type usually has lists Lists and other records in readable format are of this typean easy-to-read format. The records are separated by spaces, commas and other symbols in the editor., or other characters |
REG_EXPAND_SZ | Data string of variable length ending with a null .character | This type contains undisclosed Undisclosed links to environment variables are of this type. |
REG_FULL_RESOURCE | A sequence of nested arrays. | This type is designed used for storing the list of device resources and drivers.or drivers |
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The settings in the Tweaki utility affect the values of the registry keys — see Tweaki.exe utility for advanced setup of the Axxon PSIM software system. |
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