ircII help: ctcp ping

Usage: CTCP <nick> PING <current time>
  Current time is the same as what the function $TIME() returns and
  represents the number of seconds since Jan 1, 1970.  Other ircII
  clients will take a CTCP ping and bounce the time back to you.
  This CTCP function is used by the PING command.

See Also:
  PING