Okay. The Foreccast - is the number that is awaited by the majority of analytics , or ( and agencies ) , the prior number is the number that was in the past.
In your (Gazuz ) case no change is expected, so if it will be like that , there will be no affect on the market. But if for example the official number will be 7 instead of 5 ( which was awaited ) it would mean that the situation is worser that expected, and people start rapidly closing long positions on USD , and opening short. If the number will be for example 3 instead of 5 , the situation will be right the opposite. You should understand the meaning of every event. For Dukascopy calendars, you can click on most of the economic calendar lines, and there will be an explanation for it. Just click on the uneploynment rate, and you can read about its influence.
Official numbers are not posted in most of the calendarts ( becouse it is a lot of work, tracking down all the news and posting them ) , they can be taken from news sites, like
www.bloombers.com or
www.forexnews.com .
So here is a table translated from one russian book i have about fundamental analysis. It shows you how the prior ,forecast and official numbers are influencing the market.
First 3 positions of the table are comparing just the forecast and the oficial numbers, the last 2 also look at the prior numbers.