The two imagemap formats Visual Thought supports are: 

* NCSA HTTPd server-side imagemaps 

Most web servers support this format. If you look at an image on a web
site that is imagemapped, you can tell it's a server-side imagemap if
your mouse movements over the image generate a series of coordinate
locations like "203, 54" on the browser's status line. You don't get
information about hot zones, or any indication at all if clicking will
do anything until after you click. A typical line in an NCSA imagemap
file looks like:

          rect /vt-tips.html  154,217  230,257

* Spyglass client-side imagemaps 

Netscape 2.0 and Microsoft's Internet Explorer 2.0, among other
browsers, support this format. You can tell you're looking at an image
with a client-side imagemap if your cursor changes when you're over
hot zones, and your browser's status line tells you the URL of a hot
zone's link. Obviously, it's preferable to use client-side imagemaps,
but not all browsers support them. A typical line in a Spyglass-style
imagemap file looks like:

          <area shape="rect" coords="154,217,230,257" href="/vt-tips.html">
