How do I ping someone using MS-DOS ?

Factual Questions
1

What do I type?

2

is it another computer on your LAN? If so, type:
ping 159.15.4.82
and put the recipients IP in instead of the one I put in there.

The reply should either be:
timed out
or
reply from (IP address)

3

There are also flags that you can use when pinging, to do things such as resolving the IP address into what its name is. Type “ping -?” to see a list of these. There’s also tracert, which is like ping, but shows the whole path that it takes across the internet.