How to Rename Yahoo Messenger Title Bar

You can change the text that appears at the very top of the yahoo messenger window by editing the ymsgr.ini file.  Find the ymsgr.ini file in Program Files\Yahoo\ and open it. Then at the end, type this:
[APP TITLE]
caption=YOUR TEXT
change YOUR TEXT to whatever you want it to say. Then save the file and close messenger. When you restart messenger you will see your new message.