Apologies for the lack of clarity.
S&S Couplers are indeed what lets a frame be broken down into 2 or more pieces to suitcase or ship the bike
http://www.sandsmachine.com/ IPS is independent pedaling systems, basically a bottom bracket and freewheel assembly on both the captain and stoker position so that either pilot can stop pedaling or they can pedal out of phase. Patented by Advanced Transportation products in 1999
http://www.google.com/patents/US5964472 Quote from reever on Nov 25th, 2015, 10:32pm:Okay Mr. Wizard, I think I know what one of those is....the other I have no clue. It is the type that can be broken apart into two pieces for easy shipping. The other I have no clue. I also have a Draftmaster carrier for it.