And it enables some fun uses too, like chatting on Internet Relay Chat (IRC).
There are lots of ways to connect computers together.
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Examples include: Parallel ports were not used for communications as much as serial ports were.
Often there was just one parallel port compared with two serial ports on a computer, and the parallel port was often connected to a printer.
The name is a tongue-in-cheek sound-alike to Ethernet, and refers to the use of someone wearing sneakers as the transport mechanism for the data.
DOS has been an obsolete operating system for close to twenty years but it still shows up in a few places: Back when DOS was a current operating system many machines were not network connected at all.
On a modern operating system networking is a standard function and great effort has been made to make it easy to setup.