Multiple Objects w/ single trackable

I know I'm asking a ton of questions but the more I ask the more I learn. :D Please bare with me. I'm learning. Couple questions: I noticed that the 3rd place winner in the contest "inch high stunt guy" was able to have multiple 3d obj's on one image target and was able to have the user move them around. As well as have animation controllable via on-screen buttons. There has yet to be a AR "game" example/sample or tutorial so I'm curious... How can I have multiple 3d obj's to a single image target and have the user control the character in "AR". I've searched all over the web for some sort of tut on this but avast I've found nothing. Any insight or tut of sorts would be very very much appreciated. What I have is an imagetarget that is a layout of streets and "lots for buildings". I would like to have the 3d obj's of the buildings show up fixed on their respective locations, have a character that can be moved around the board via an onscreen button or through the use of the xperia play controls. I know this may be a long shot but I'm confident this would help other potential or current devs with some foundation to start creating AR games like Mattel's proto "rock 'em sock 'em".