ping

And if riches be a desirable possession in life, what is more rich than Wisdom, who produces all things?
Wisdom 8:5

Verifies IP-level connectivity to another TCP/IP computer by sending Internet Control Message Protocol (ICMP) Echo Request messages.

http://en.wikipedia.org/wiki/Internet_Control_Message_Protocol

http://www.faqs.org/rfcs/rfc792.html
Gates, Bill: Microsoft’s Vision
[audio:http://www.freeinfosociety.com/media/sounds/20.mp3]