I can easily change a message back and forth between upper case and lower case letters.
HOW can I do a large group of file names?

thanks
Ethan

Never doubt that a small group of thoughtful, committed citizens can change the world. Indeed, it is the only thing that ever has.
"Why shouldn't the American people take half my money from me? I took it all from them." - Edward Filene

for a large group of file names 1-4a Rename can do it. http://www.1-4a.com/rename/