SUMMARY
In Windows NT version 3.1, the following pairs of application programming
interfaces (APIs) have the same functionality:
GetSystemDefaultLCID() and GetUserDefaultLCID()
GetSystemDefaultLangID() and GetUserDefaultLangID()
The user LangID and LCID are always set to the system value. In future
versions of Windows NT, it will be possible to set the LangID and the LCID
on a per-user basis.
Note that it is possible to set the LCID on a per-thread basis [that is,
SetThreadLocale()] in Windows NT 3.1.