Forums Scripts & Popups What event could this be?

I'm trying to script something that is comng from the server, but i can't work out what the event is.

The command is /whisper #chan $nick hi
and that get's sent out as

-> irc2.server.co.uk WHISPER #testing Cemtex :hmm

mIRC shows it like this when someone sends the whisper to you.

*Cemtex* whispers: hi

The debug comes through as this

<- :Cemtex!Cemtex@88.88.88.88 WHISPER #testing vexed2 :hi

Any ideas on how to capture this with an event?