DO allow the host to give the first toast, and allow the guest of honor to return the toast towards the end of the meal.
DO maintain eye contact during a toast.
DON'T cut dumplings with your knife. Instead, use your knife to hold the dumpling and cut it up with your fork.
DON'T put up a fight over who pays the bill at a restaurant. Whoever invited everyone out is who pays the bill. If you are invited out to dinner during your visit to Austria, reciprocate and invite whoever invited you to a nice meal.
DON'T discuss business over a meal unless the host initiates it.
DO put your napkin on your lap as soon as you are seated.
DON'T begin eating until the host says "mahlzeit" or "Guten Appetit!"
DO eat as much of your food with a fork as you can. By not using your knife, you are complimenting the chef because it lets them know that the food they cooked is very tender.
DO put your fork and knife side-by-side on your plate with the handles facing to the right when you are done eating. This indicates that you're full.
DON'T leave food on your plate at a dinner party.