Mac Address

Stands for "Media Access Control Address". A MAC address is a hardware identification number that uniquely identifies each device on a network. The MAC address is manufactured into every network card, such as an Ethernet card or Wi-Fi card, and therefore cannot be changed. Because there are millions of networkable devices in existence, and each device needs to have a unique MAC address, there must be a very wide range of possible addresses. For this reason, MAC addresses are made up of six two-digit hexadecimal numbers, separated by colons.

Atom

Atom is an intended replacement for RSS and like it is used for syndicating a web site's content. It is currently not nearly as popular or well-supported by software applications, however.

Port

Internet port: this is a number that indicates what kind of protocol a server on the Internet is using. For example, Web servers typically are listed on port 80. Hardware port: this refers to any one of the ports that are on the back of a computer where devices can be hooked up (like a keyboard, mouse, printer, digital camera, etc).