I have used AP twice at Newark as POE. At POE, along with your passport just submit your passport, AP, 485 receipt, I-94 and customs form. You will be taken to a secondary inspection room. Your passport and AP will be stamped after verification in BCIS database. You might be asked couple of questions before the passport is given back. They might ask your SSN, sponsor company name etc. Some people say you need a visa if you go to Paris. Indian officials know about AP and no problem in India. Just keep copies of AP and 485 receipt with you.
Good Luck!!!