Changing the Keyboard in Arabic, Hebrew, & Greek Windows

SUMMARY

In the Arabic, Hebrew, and Greek versions of Windows version 3.1, you can can change the keyboard language dynamically.

The WM_KEYBOARD_CHANGE and WM_LANGUAGE_CHANGE messages are sent to applications to inform them of the language change.

WM_LANGUAGE_CHANGE is sent prior to changing the keyboard language. It is not sent it to the topmost window of the active application. It should be ignored by the application, unless for some reason the application wishes to stop the change of language. wParam holds either KEYB_LATIN or KEYB_BIDI. lParam is undefined.

WM_KEYBOARD_CHANGE is sent to the window with the focus whenever the keyboard language changes. It is sent to the active window. wParam holds either KEYB_LATIN or KEYB_BIDI. lParam is undefined.