How to assign a custom key for switching keyboard input languages in Windows 7?

Question

How one can assign a custom key (e.g. Scroll Lock) for switching keyboard input languages in Windows 7? (Apart from Ctrl-Shift or Alt-Shift). Preferably not using third party programs. Maybe by changing some settings in registry?

Answer 1

I'm fairly sure that you won't find a way to do this natively within windows, but Autohotkey and Autoit both make it very easy: http://www.autohotkey.com/docs/Hotkeys.htm

In Autohotkey this should work: ScrollLock::Send {alt down}{lshift}{alt up}