Simulating multiple sit targets per prim, possible?

I know there is a thread here somewhere but as the search rejects the word "sit" from my search parameters I have been unable to find it again. So I have two questions:

First is it even possible to simulate multiple sit targets for a single prim and have two avatars sit on that prim?

Second if the first is possible, would some one be able to offer links to the related thread(s)?

See ... but also, see (it's b0rked at the moment).

Thanks for posting those links. I am sure they will be helpful in a few projects I will be working on in the near future.