On pong
From Scriptwiki
The on PONG even triggers when you receive a PONG reply from the server after sending it a ping.
on <level>:PONG:<commands>
Read access levels to get more info about the <level> field.
Note that you can't use this to intercept /pings to your own nickname, this is used internally by mIRC.
Example
on *:PONG: {
echo -a Got a pong from the server: $1-
}
This example would trigger on every pong and echo it to the active window.
See Also
To react on pings, take a look at the On ping event.
