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At the moment to ping another computer in my program I record the time send a message to another computer running my program. The other computer sends an echo when it receives the message. The sender waits in a loop until the echo the records the time again. The difference of these 2 times is the ping. This works.

Firstly is there a special ping command for C++/Winsock? And if there is how is it used?

And secondly is there a system built into windows I can use. I.e. you can type "ping xxx.xxx.xxx.xxx" into the command prompt to ping another computer. Therefore is there some magic port number I can send some special message to get a ping echo?

Thanks in advance for any help.

ping is its own protocol. Google it and look for the RFC for it ...

it's a packet, with data a certain way, a port I think thats it...

BTW - as such, it might be blocked on firewalls as a security precaution. ping can be used for good and evil.