Unix: puts some fake text on your screen so nobody knows you're mudding.
Windows: will hide all the yTin windows and the windows that you specified
   in View/Options menu. If add passwd, u need the same passwd to re-open
   all the hidden windows later.
   Default hehavior is send #boss command when ESC is hit.
   If one wants to add a hot key to send #boss some-command, use macro.