Code:
 on *:TEXT:*:#: {
  if ($read(vip.txt,nw,$nick)) {
???
  } 
 else { return }
}


When someone type in chat, bot check the vip.txt. If the user is in the file then don't do noting (just post the msg).
If the user is not in the list, don't type the msg.
Like that:
[ Dvd1 is vip. ]
[ Dvd2 is not. ]
Dvd1: apple
> Bot check, (dvd1 is vip) and in the chat:
Dvd1: apple
Dvd2: orange
> Bot check, (dvd2 is not vip) and in the chat:
Nothing.