but from memory to do that you need to intall their software (or did last time I looked)
Well you certainly haven't had to do that for the last 3 years! No software installed on any PC, either to configure or use it.
I initially had the family ones installed, but found that they were too restrictive. The configurable ones give you 56 categories to allow / block, plus at least 15 or 20 domains you can add as exceptions for the free subscription, increasing to many more if you pay.
SD