In large soup pot, add about 5-6 quarts of water.  Add Old Bay seasoning and bring to a boil.  Add potatoes, boil for 15 minutes.  Add corn, boil for 10 minutes.  Add kielbasi, boil for 5 minutes, then add shrimp and boil for 3-4 minutes.  Drain carefully into a large colander.  Put in large bowl and stand back.  Serve cocktail sauce for shrimp and spicy brown mustard for kielbasi on side.