The Quit button causes the viewer  to  exit.   There  is  no
verification popup, we just exit quietly.

Note that this  HTML  viewer/browser  handles  each  of  the
display windows with a separate process.  So the Quit button
only closes the one window (and any associated info  windows
such  as  its  Source or Options window).  This is different
from Netscape, where Quit closes all the browser's windows.

This also explains why, when you  change  options,  it  only
affects the one window.