Proper conversion techniques wanted

I want to examine characters as they come through
via the OnKeyPress or OnKeyDown events but I don't
know how to convert the "char" and "word" types so
that I can change the character to whatever other
character I want to.  For example, let's say I just
want to UpperCase the character coming in.

If "Key" is a "char", what does the code look like?
If "Key" is a "word", what does the code look like?

Whatever I've tried, I keep getting invalid type
conversion or mismatched types.

Thanks for any help in advance.
--
Bruce Goldstein
Software Engineer
Interactive Strategies, Inc.
br...@centcon.com