Ya, you are right. In the case of this switch hack Im being told its only just running a few processes in memory, I didnt think that was all that was needed.So...
I download an Ubuntu live CD. I boot it up, but I want to use SuperMagicApp3.11. However SMA3.11 isn't included in the live distibution, I have o use the software centre to download and ...install it, no? It's only temporarily installed because as soon as I reboot the live distro it will be gone again; but it absolutely has been installed; otherwise I wouldn't be able to run it.