Basic hardware

A multi-site system can be created easily because today's computers are oversized for simple and routine tasks such as office automation and Internet browsing.
Today is very common for a graphics card has multiple outputs so that you can connect multiple monitors without having to buy new graphics cards.

Also, a current motherboard usually has a sufficient number of USB ports. Still, it is advisable to add a USB hub like the image below for each workstation.

In the next picture we see six friends who have taken the multiuser to a somewhat extreme case, they have sat six at a table too small. But it is enough to understand that the idea is real and functional.