The text is divided in standalone pages without scrollbars, at least if your
screen resolution is at least 1000*700. You can use a smaller screen, but
then you'll have to scroll a lot and the screenshots will be difficult to read.
Everything can be accessed without a mouse. Pages can be navigated with the pgUp/pgDown keys, with the nex/previous buttons at the top of the page, or by
clicking in the table of contents.  Screenshots are indicated by a
<script>mkLink("1.1.jpg")</script> .
They can be navigated by the keyboard arrows and viewed 
by entering or clicking. 
When looking at a screenshot, pressing any key
will return you to the text (as well as pushing the back button of your
browser, or clicking in the table of contents). Oh, and by the way, don't 
try to push the buttons on the screenshots: they won't work.
