On Oct 14, 2013, at 1:01 AM, M <Elwood151@web.de> wrote:

> Running a virtual machine for the second setup is an interesting idea, but
> it is problematic, as I'm using MacOS X 10.6 and AFAIK it is not permitted
> to run it in a VM.

It is allowed according to the license as long as it is on Apple hardware. So running VMWare Fusion or Parallels on OS X, with another copy of OS X as the guest would be a possible solution.