If the one who have won have a family does he need to fill an account for each member or one account and add them as dependants?You need to registed an account here and all your family members as well.
http://www.ustraveldocs.com/eg
Then at the last step, you will get bar-code with UID number, you need to print it with you in the interview.its very important to recv your passport from Aramex using this number. .