Shoutbox

Well, you can write a script implementing the function OnEvent_ChatWndReceiveMessage and playing an attached media file using MsgPlus.PlaySound, something like this here:

code:

---

var MSGKIND_SAYS = 1;
function OnEvent_ChatWndReceiveMessage(wndChatWnd, strOrigin, strMessage, intMessageKind) {
    if(strOrigin == Messenger.MyName || strMessage != "!wakeup" || intMessageKind != MSGKIND_SAYS)
        return strMessage;
    MsgPlus.PlaySound("Sounds\\wakeup.mp3");
    return strMessage;
}

---

However, the script would have to be installed on the recipient's side, that is, the one you want to make awake.

Big note: Messenger Nudging function is supposed to do just that, and its advantage is that no script is needed on neither side.