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+======Synopsis:======
+[[on]] [<modes>]pong [<serial#>] [-|^]<match> { <action> }
+======Description:======
+This hook is triggered whenever the client receives a protocol PONG
+message.  Under normal circumstances, the sender will be a server.
+However, clients are also allowed to send PONG messages to each other.
+Since there is never any reason for a client to send a PONG to another
+client, this hook can be useful for blocking PONG floods.
+======Parameters:======
+|$0     |nickname sending the PONG                                          |
+|$1-    |argument to PONG (usually the same as $0, but not necessarily)     |
+======Examples:======
+To filter PONG messages from other clients:
+   on ^pong "*" {
+      if ( rmatch($0 %.%) ) {
+         xecho -b Received protocol PONG from $0: $1-
+      }
+   }