I have been on the DxDP 3 times (and about to start my fourth in 9 days!) and the app menu is always anything in the "starters" like other posts have said.
I have gotten soups, salads, and everything in between. If it is an "entree" salad, it will count as an entree (such as the LTT salad at lunchtime is an entree), and it's really obvious to tell the difference. Almost all of the menus now are streamlined to make ordering the DP easy (the only exception to this is DTD restaurants that have more extensive menus).
Just be careful about apps/desserts "for two" or "for four" USUALLY require two people to use their credits, though this is not consistently so. Example: my brother was rejected when he wanted a "for two" app (the dim sum basket) at Yak and Yeti, but got a "for two" app at BOG no problem (the meat/bread board).