explanation of "Backend Limit" I see in the stats page

[John Cherouvim]

Hello

I have this configuration for a backend containing a server:
backend static_backend
    option forwardfor
    server s localhost:80 maxconn 900

On the stats page though I see a "Backend" row which shows almost the 
same numbers for my "s" server. What does this represent?
That "Backend" row shows a limit of 200 (marked with red in the photo 
http://i.imgur.com/YWNsStZ.png ). What exactly is that limit and how can 
I change it?

thanks