Ping 3 : Ping is a computer program that sends a packet over the internet to another computer to see if the remote computer is still responding. If the ping returns to the sending computer the remote computer is still connected
Young & Company Electric Power Products and Related Engineering Services, Glossary of Electrical Terms, http://www.youngco.com/young2.asp?ID=4&Type=3, CA., USA 2001. (Electr Sfty - Amer) {514}