Complex elevator

I was looking for a tutorial on how to make an elevator that would go
directly to the floor from which the call button was pressed and have
several buttons in the elevator to choose which floor to go to. All
I've been able to find is an example map posted after a tutorial for a
simple elevator,
here(at the
bottom). Its exactly what I had in mind, but there is no tutorial about
it and I can't quite decipher how it works exactly. I kinda get it, but
its pretty confusing. A little bit of an explanation would help a lot.

well, you actually helped me figure something out. I now know how to make elevators :biggrin: and Rejected is awesome.