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| TABLE 1:
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| Value Type | Description |
| REG_NONE | No value type |
| REG_SZ | Unicode NULL terminated string |
| REG_EXPAND_SZ | Unicode NULL terminated string that can have embedded environment variables |
| REG_BINARY | Arbitrary length binary data |
| REG_DWORD | 32-bit number |
| REG_DWORD_BIG_ENDIAN | 32-bit number, high byte first |
| REG_LINK | Unicode symbolic link |
| REG_MULTI_SZ | Array of Unicode strings |
| REG_RESOURCE_LIST | Hardware resource description |
| REG_FULL_RESOURCE_DESCRIPTOR | Hardware resource description |
| Resource requirements | |
| TABLE 2: Registry Root Keys | ||
| Root Key | Description | Link |
| HKEY_CURRENT_USER | Information related to currently logged-on user | Subkey under HKEY_USERS corresponding to currently logged-on user |
| HKEY_USERS | Contains subkeys for all local user accounts | Not a link |
| HKEY_CLASSES_ROOT | Contains file association and OLE registration information | HKEY_LOCAL_MACHINE\ SOFTWARE\Classes |
| HKEY_LOCAL_MACHINE | All static and dynamic system configuration information | Not a link |
| HKEY_DYN_DATA | Performance counters | Not a link |
| HKEY_CURRENT_CONFIG | Information about hardware configuration | HKEY_LOCAL_MACHINE\ SYSTEM\CurrentControlSet\ Hardware Profiles\Current |
| TABLE 3: Registry Root Key Abbreviations | |
| Root Key | Abbreviation |
| HKEY_CURRENT_USER | HKCU |
| HKEY_USERS | HKU |
| HKEY_CLASSES_ROOT | HKCR |
| HKEY_LOCAL_MACHINE | HKLM |
| HKEY_DYN_DATA | HKDD |
| HKEY_CURRENT_CONFIG | HKCC |
| TABLE 4: HKEY_CURRENT_USER Subkeys | |
| Subkey | Description |
| AppEvents | Sound/event associations |
| Console | Command window shortcut settings (e.g., width, height, colors) |
| Control Panel | Screen saver, desktop scheme, keyboard, and mouse settings |
| Environment | Environment variable definitions |
| Keyboard Layout | Keyboard layout setting (e.g., US, UK) |
| Network | Network drive mappings and settings |
| Printers | Printer connection settings |
| Software | User-specific software preferences |
| UNICODE Program Groups | User-specific start menu group definitions |
| Windows 3.1 Migration Status | File status data for systems that upgrade from Windows 3.x to NT 4.0 |
| TABLE 5: | |
| HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet Subkeys | |
| Subkey | Description |
| Control | Static NT tuning and configuration parameters |
| Enum | Information collected when drivers and services are started |
| Hardware Profiles | Video-related configuration information |
| Services | Startup and error control for device drivers and services |
| TABLE 6: Services Values and Subkeys | |
| Value | Description |
| DisplayName | Name shown in Control Panel's Services or Devices applets |
| ImagePath | Pathname of service or driver file if it's not in SystemRoot\System32\Drivers |
| ErrorControl | Indicates action NT will take if service or device reports an error when it starts |
| Start | 0=Boot Start (core drivers)
1=System Start (at blue screen) 2=Auto Start (after Win32 startsapproximately when logon prompt appears) 3=Demand Start 4=Disabled |
| Type | Kernel-mode driver, File System, Win32 Service, etc. |
| Group, Tag | Controls load ordering for Boot Start and System Start drivers |
| DependOnService, DependOnGroup | Controls load ordering for Auto Start Drivers |
| Parameters | Stores driver/service-dependent private settings |
| TABLE 7: Tuning a Workstation | Target Tuning Option | LargeSystemCache | Size |
| Minimize Memory Used | 0 | 1 |
| Balance | 0 | 2 |
| Maximize Throughput for File Sharing | 1 | 3 |
| Maximize Throughput for Network Applications | 0 | 3 |