Sent to the topmost affected window after an application's input language has been changed. You should make any application-specific settings and pass the message to the DefWindowProc function, which passes the message to all first-level child windows. These child windows can pass the message to DefWindowProc to have it pass the message to their child windows, and so on.
A window receives this message through its WindowProc function.
The character set of the new locale.
The input locale identifier. For more information, see Languages, Locales, and Keyboard Layouts.
An application should return nonzero if it processes this message.
Minimum supported client
|Windows 2000 Professional [desktop apps only]|
Minimum supported server
|Windows 2000 Server [desktop apps only]|
Build date: 2/25/2013