Case sensitiveness in MS Word

I do not remember which button to press if I want to make a small word in all upper case or vice versa after it is highlighted.
Anyone can refresh my memories?
thanks!

If you are working in MS Word 2003, you can go through "format" -> "capitalization" and do the case sensitive settings there.

Thanks for the suggestion, but I recalled that I just need to press a key combination ... without having to use the tools menu.

SHIFT + F3

Select the text and then press the buttons at the same time indicated.