The handle on this window controls the lock that holds the panel closed.
The rear panel is quite traditional. At least I can see nothing extraordinary here:
The only thing I haven’t yet met in system cases from other manufacturers is prepared holes for the tubes of a liquid-cooling system:
You can see those holes in the bottom right corner of the panel. Special plastic grommets are enclosed with the case. You should put them in for the tubes not to get cut on the metal edge of the openings.
The external USB, FireWire and audio connectors are located on the right panel of the case:
Considering the direction into which the front door opens, the access to these connectors will be easy if you have this system case standing to the left of you. The manufacturer must have disregarded the fact that you can’t sometimes put the case where you’d want it to be. But you can disregard these connectors, too, if you don’t use them very often.