Two more questions:

1. How do you stop one target to switch to another?

I get the error: "You must close your other Scratchbox sessions first"

2. Can scratchbox support more than one SDK? I downloaded the 4.0 installer and have it working (I think...I'm compiling & running programs, but have no chinook to test them yet) and I thought I would install 3.X to play with in the meantime. However the 3.1 sdk installer tells me that I don't have the proper toolchains installed.