For each user:
Exists (boolean): Whether the key exists or not.
Exists
Sid (string): SID of the user.
Sid
Username (string): Domain\Username of the aforementioned SID.
Username
NativeServices.RegistryUserKeyExists(Subkey:"Control Panel\\Colors");
The following statement is a useful way to correlate any user account with its SID on a device.
NativeServices.RegistryUserKeyExists(Subkey:"");
This method may attempt to call AD to translate a SID to a username.