HI all,
Just installed 7.4 and copied the .iso file to a flash drive with the filename "k74.iso", booted with the DVD and typed:
knoppix64 bootfrom=k74.iso
You don't even need to specify the device as knoppix does a search for it.
Pretty cool!
Bootfrom may have been back before 7.4 (can't remember when it stopped working) but I haven't tried it until now.
Don