telnet

noun

1. (uncountable)A network protocol that enables one computer to communicate with another via a local area network or the Internet.
2. (countable)The program that acts as the client for such communication.

verb

1. (intransitive)To use such a program to make such a connection.

   “I've been running tin with nano in Terminal in my Mac since 2003, and before then, by telnetting in to my university's server, which I first started doing as a first year undergrad in September 1993.”