Site Builder stored onto flash drive or other device?

[Awaroa]

Hi,
I was wondering if it is possible to have the site builder software stored onto a flash drive so that all I need to do is plug it into any PC and can continue building my site from where I left off?
The reason I am asking is that as I do not have my own laptop I use several different PC's and do not want to have the site builder software installed on them. Ones a work computer, the others a friends etc.
Many thanks for your answers.