Is there a way to develop app which accepts input in many languages (serbian latin, serbian cyrilic, german, french...) at same time? Example for serbian latin and serbian cyrilic: шђчћ šđčć + german special characters etc. Program is for library.
What code page for tables, forms? Font? Settings from control panel-regional and language options-advanced-language for nonunicode programs?
User should enter text in different languages simply by changing keyboard input language from serbian latin to serbian cyrilic etc. Any suggestions?

Thanks in advance.