Shoutbox

Hey
Im sure this is already possible but at the moment i just cant remember so could someone please point it out for me.
Is there a way of sending a specified msg back to someone only if they type a certain word.
The reason i want this is to be able to send something to another computer in my house that is signed in with a different account and get it to reply back to me automatically. I am not talking about away msgs cos i dont want to it say it everytime anything is sent.
For simplified example of this is can i send the word 'date' and it will reply with the text '(!D)' thus using a plus command and displaying todays date?

Thanks