Two avs moving together on poseball set

I'm a very new scripter, so I'm not sure where to start on this project. I didnt see any free things like this in the library. I'd like to make things that have two pose balls, possible with objects attached that allow two people to move together with as they are on them. Saddles like if someone is in a dragon avatar and the other a rider work like this, or if you put two pose balls down and the two avatars are always holding hands as they walk around. What kind of commands should I look into?

Any tips, etc are welcomed!

Thanks,
prismatica

Sounds to me as if what you're looking for is a vehicle script. At least that's how those holding hands walk thingies are done. See http://www.lslwiki.net/lslwiki/wakka.php?wakka=vehicles.