In our example, Fritz has looked at three moves that it previously considered better then Bh3. It will need to look at 27 more moves before moving on to the next ply. Looking at this number in parentheses tells you how deep Fritz has gone into the search of the current ply. This is because Fritz sees that these lines are very inferior to the top four or five moves it's considering and doesn't need to search them as thoroughly. The last entry at the top of the display is the speed at which Fritz is evaluating.
Nodes are positions.
In our example, Fritz is searching at the speed of 60 times 1,000 nodes per second, that is 60,000 positions a second. I don't suppose I need to tell you that this is incredibly fast. Fritz enjoys the reputation of being the fastest analyzer on the market. The lower part of the window is fairly easy to understand. In the example above, the line starting with 15.Bd2 is one in which Black has a large advantage.