Ping
Ping is a basic Internet program that allows a user to verify that a particular IP address exists and can accept requests.

POP
POP stands for Post Office Protocol, and is one of the technologies used for that all-important medium of communication: email. Like many other computer-related things, email requires a special language for mail to be received or sent. POP is one of the technologies that allows email sent from anywhere in the world to arrive in your inbox.

POP Retrieval
The POP Retrieval Service will download mail via POP from a remote POP server and deliver to a local mailbox. Users are able to configure their own settings from Webmail. This means you can retrieve your emails from different mail accounts and view it on their local mailbox without having to log in to each separate account