GetPolicyInteger looks up a registry value in the local machine's path for system policies, or returns the given default if it can't.

GetPolicyString looks up a registry value in the local machine's path for system policies, or returns the given default if it can't.

GetRegInteger looks up a registry path in the local machine path, or returns the given default if it can't.

GetRegString looks up a registry path in the local machine path, or returns the given default if it can't.

IsSIDValidPrincipal determines whether the SID contained in uid represents a type that is a valid security principal under Windows.

RegBase is the registry path inside HKEY_LOCAL_MACHINE where registry settings are stored.