here we go. this thread will illicit all kinds of feelings.
try searching under piston and see what you come up with.
there are two pistons in high end marker bindings: the comshock piston and the "piston control" piston. there are actually few differences between the bindings with these features.
bindings with a din 3-12: may have the piston control plate (if you opt for it), and ti construction in the heel for lightweight.
bindings with a din 4-13: comshock piston, ti construction, and the piston control plate (if applicable)
bindings with a din 5-14: comshock piston, steel construction for durability, and the piston control plate if applicable.
i recommend the marker website www.markerusa.com
for a full explanation of what these pistons do.
if you are looking at systems that have pistons built in, that piston operates on the same principles as the piston control plate. there are often loads of other (sometimes) intelligible letters and abbreviations in the name of the ski/integrated system. the best way to understand the whole name of the system is to go the ski manufacturer's website. using the din range on the available binding you can match to my simple list up top.
if you have specific questions, private message me.