[QUOTE: 1) Do I even have to go through immigration at DUB? Is there a rope I can duck under instead of going through immigration, since I just want to get over to the departure area for the flight back to ORD (which is probably the plane I just got off)?]
Just for future reference -- in case you weren't being facetious -- circumventing the security flow at any airport is highly frowned upon by heavily armed (and in the case of TSA, badly trained) people.