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_getnamebyIP
This is the usual BSD function. It converts an IP address into a name. This can be quite long, because it requests the DNS server. If computer has problem to access the DNS (by example if it is not connected to internet), it can take about 1 minute.

S _getnamebyIP (
S
)
Parameters

IP address
Return value

name of an internet computer (such as 'www.cryo-networks.com')