Gotta love it when people try to be cocky even when they don't know what they're talking about
Edit:
Infact..
Note: You can't prevent the standard version reply from being sent.
Oh the irony
You do gotta love it. There are countless ways to change the reply, including but not limited to:
mIRC DLL's.
Socket Connections.
mIRC's internal /debug alias
External applications.