The exchange is just your number count of contacts in the pa contest, and your arrl section. If you have worked 10 contacts that are in the PA party, then you give the next person an 11, if you work a non contest person, then you don't count them on your"contest log".
I'd love to get into the other parties, but I'm helping at the local scouting event doing the ham stuff. I'll be trying to make DX contacts with the scouts to other scouts.