A locale identifier (LCID) is a DWORD value containing the language identifier in the lower word and a reserved value in the upper word. The identifier supplied in an LCID is a standard international numeric abbreviation. This LCID has the components necessary to uniquely identify one of the installed system-defined locales.
Applications can use the MAKELCID macro to create LCID values.
There are two predefined LCID values: LOCALE_SYSTEM_DEFAULT is the system default locale, and LOCALE_USER_DEFAULT is the current user's locale.