PING
From Dark Signs Online
int PING(string server)
Pings the specified server, returning 0 if the server doesn't exist and 1 if it does.
Parameters
server The server to ping. Can be an IP address or domain name.
Example
Check if the site that is given exists.
$v = PING(1.1.1.1) WAIT FOR $v SAY Response : $v on IP 1.1.1.1