no.. multi-boxing today is a combination term.

to be strict, early on... multi-boxing required multiple physical computers (with screens)... but with advances in computer hardware and software multi-boxing systems, it became possible to run multiple game clients per machine. technically speaking, this was known as multi-instancing... but that term was short lived... as people soon started using multiple computers... each running multiple instances.

and so, a single term has become the defacto standard to describe what we do.

multi-boxing