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Theoretically, you could "ping" an IP address to see if they (a buddy, I presume...) is "online". But even so, depending on your "buddies" service, they may have a "dynamic" address, which means everytime their modem/router shuts off, they are assigned a new address. This could/would only really work if your buddy has a "static" IP address.
Even so, some routers (and most software firewalls) are equipped to block ICMP (Ping), so even if they are "online" they will not respond to your ping, making you look like they are offline.
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