Any one know of a way to script and send the "typing message" notification event seen in the bottom of the chat window prior to sending a message via a script.

No need to explain why it would be helpful.
ie. scripts takes long to respond to due load or prcessing etc.
opps

Theoretically, it's possible, but it would require some real low-level work, which means a helper DLL.

I tried writing text to a window and setting focus similar to

Interop.Call('user32', 'SetFocus', ChatWnd.Handle);
var orig = ChatWnd.EditText;
ChatWnd.EditText = ChatWnd.EditText + " ";
ChatWnd.EditText = orig;

but id doesn't seem to be working. In tabbed chatting the tabs "DONT CHANGE" either. something might be wrong with my Interop

any ideas along this direction?

What are you trying to do there?

In theory I'm trying to give focus to the chat window I want to send the "text typing message".

then by changing the text window and resetting it. I'm expecting messenger to see this as activity and then send the "user is typing" message to the other user. 

What would trigger Messenger to send this message?

Simply changing the text won't trigger the notification: you'll ahve to send simulated keypresses.

I used the windows api call to "SendMessage" it actually enters text in the message box, but it still doesn't trigger the notification? any ideas?