VanHalenLover sez.....
"I thought that the 'deny' option allowed you to respond with text?"
You're correct, VanHalenLover...I used it last night to explain why I couldn't join someone that invited me to play. A small chat box opens upon denial, and one can give a short explanation as to why he/she can't accept the invitation......and makes it a little more personal than a computer-generated NO.