[Lazarus] What's behind an IP address

[Antonio Fortuny]

Hi Folks.

This is specifically neither a Lazarus nor an FPC question but because 
I'm using a Lazarus project (along with Synapse) I ask this question:
Having an IP address, which could be the best question to ask to that IP 
to know what's behind this address ?
- Echo (ICMP 7) is not sufficient
- Get an SSH connection: if it answers then should be almost certainly a 
Unix box otherwise can be a Win box
- if it a Win box, how to confirm ?

Thanks a lot,

Antonio.