ircu/PING
To verify the connection is alive and optionally measure response time.
/PING :<string>
Makes the server respond with a PONG followed by the servername and the specified <string> parameter, which for example can be used to measure the server's response time (lag meter).
History
At some point /PING was also used to PING to remote servers, the syntax appears to have been "/PING <string> <server>", but that does not work anymore.
