Question: what is the difference between hkey_current_user and hkey_users?
Answer: HKEY_CURRENT_USER (HKCU) Abbreviated HKCU, HKEY_CURRENT_USER stores settings that are specific to the currently logged-in user. The HKEY_CURRENT_USER key is a link to the subkey of HKEY_USERS that corresponds to the user; the same information is accessible in both locations.