Everything is installed on the flash drive. The only thing on my computer is the short cut to start it up after plugging in the drive.
The down load only took a couple minutes but the installation took over 45. I wasn't expecting that and it made for a short night sleep. (I had to play when it was finished)
As for mac, it's a WAMP server.
I just checked and, for now at least, the 4GB flash is kinda over kill.
Currently the server and all my files are only taking up 218MB of space, so the whole works isn't very big. (my files are less than 1MB).