Originally posted by sdrblr
Open DS 156 pdf thru the link given in your appt confirmation letter. After completing it you hit submit button and it re-generates the pdf file with your info and creates a bar code in 2 different places(one above the place where you paste your picture and another on the last page.) So your initial 2 page 156 pdf will be now 3 page pdf with just bar code and your name on the 3rd page.
All that you have to do is print(you can also save) this pdf and take it with you to embassy/ consulate.
If you have submitted this well in advance, they have sufficient time to check your info and this will help when you go there...as they have all the info and all that they have to do is scan the bar code and view the info. This is what I did...i submitted online 20 days in advance.