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# Registry Key Info

Typical key structure for the registry is:

| Folder / predefined key | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| ----------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| HKey\_CURRENT\_USER     | Contains root config regarding the user who is currently logged on. This directory can consist of folder, screen color and Control Panel settings. (HKCU)                                                                                                                                                                                                                                                                                                                                                                                                                            |
| HKEY\_USERS             | Contains all actively loaded user profiles                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| HKEY\_LOCAL\_MACHINE    | Contains config information particular to the computer (for any user). (HKLM)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| HKEY\_CLASSES\_ROOT     | Subkey of `HKLM\Software`. Information stored here makes that the correct program association occurs when you open a file through Windows Explorer. Sometimes abbreviated as HKCR. `HKLM\Software\Classes` contains default settings for applications across the system. `HKCU\Software\Classes` contains config information specific to that users profile. If you are writing values to a key under HKCR, and the key has a pre-existing value within `HKCU\Software\Classes`, the system will store the information there instead of under `HKEY_LOCAL_MACHINE\Software\Classes`. |
| HKEY\_CURRENT\_CONFIG   | Contains information about the hardware profile that is used by the local computer at system startup.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |