thanks. I see this is 'a' script. I see it doesn't mention 'notice'. However it also doesn't contain the /w alias either. It does mention it once, but is used improperly. When you do:

/msg $chan /w message

It's the same as someone chatting into channel: /w message or typing in channel window:

/say /w message

So it's showing everyone "/w" instead of doing the mysterious whisper - which must be a handmade alias because it's not part of mIRC. You've got some other script messing around with the notice command, but that's a separate item.