Processing multiple files? Using wild cards?

Can someone explain how to use wild cards, or how to process multiple files?

On Dave Raggett's documentation at http://www.w3.org/People/Raggett/tidy/,
it says "Thanks to Jacek Niedziela, The Win32 executable for tidy is now
able to use wild cards in filenames. "

I'm new to Tidy. I'm experienced with Windows, but not with the Command
Prompt. I downloaded the exe from http://int64.sourceforge.net/tidy.html and
am able to use it on single files with a config file. But I can't seem to
use wild cards in the file name, for example, *.htm.

Thanks in advance,
Salan