The illustration has three boxes, labelled "Balancer1", "App server 1", and 
"App server N" respectively. Unlabelled double-headed arrows connect the 
Balancer1 box to the two App server boxes. A third unlabelled double-headed 
arrow extends from the Balancer1 box.

Inside each App server box are five more boxes; one is labelled "HTTP" 
and each of the other four is labelled "JServ".