I like your explanation, Klaus.

Since webtek has a 4 Gb Card, I think now I'd advise he download a
6.4.3 Knoppix CD and give that a try, before going out and
buying a bigger Flash Disk.

I estimate there will be around 3 Gb of additional apps webtek
can bring in with Synaptic if needed using the CD and the 4 Gb card.
This would appear to be the least-cost course to get some feel
for the Knoppix-with-persistent-store experience.