Ping is a way to diagnose network problems.
Computer A sends and ICMP echo to computer B.
Computer B reply with ICMP echo reply (putting computer's A original data in the reply)
If Computer A receives the data, it can be used to measure timeouts.
If the data doesn't arrive, it may indicate a network problem that needs further exploration.
Ping is implemented in class CPingSocket, and demonstrated in sample KomodiaPing.