For starter let's see some of the terms most often used in DV processing.
1) Visa Bulletin (VB)
Visa Bulletin is a publication regarding
immigration to the United States published by the United States Department of State. The primary purpose of this bulletin is to provide an updated waiting list (also known as Priority Date) for immigrants that are subject to the quota system.The content of the bulletin is available on the web address
http://travel.state.gov/content/visas/english/law-and-policy/bulletin.html
2) Current
We say current when visa numbers are available for a specific qualified applicant. Visa numbers are available only for applicants whose priority date is
earlier than the cut-off date listed in the tables
3) 1st NL and 2nd NL
First NL (1st NL) is the First Notification Letter that you received explaining that you are a winner. While the Second NL (2nd NL) is the Second Notification Letter that the Kentucky Consular Center send to your email describing your date, time and place of interview.
4) C.O
Is the Consular Officer who will conduct your interview in the embassy when you go for the interview.
5) P.O.E
Is the Port of Entry. It is the first entry point where you enter the United States of America after your entry is approved by the US Immigration officers.
CHEERS!