Nobody. There's been no serious usage of System III in decades.
Yes.
PS -e|cut -d " " -fname|wc -l
When a user logs in to a Unix system, the current working directory normally starts at the directory/file
A single user system is like a standalone PC. A multiuser system is several PCs or terminals networked to a server or a mainframe.
How to Benefit from Pilates
The PlayStation Phone - CNET Loaded 12.06.2010
How Drive Letters are Used
The Top 10 Group Computer Games - Part 7/10