I recently discovered that using a keyword can uncover more than 1000 results. Yay! Example: "site:www.blah.com/?" "site:www.blah.com/? a" "site:www.blah.com/? b" "site:www.blah.com/? c" ... etc LOL
I don't see any difference. In fact if I add the keyword then it displays result containing that keyword in a page for the site.