The figure highlights four primary features of the OptiLink main window.
First, the menu bar comprising the File and Help menus.
Second, the set of eight tabbed views that control the OptiLink program
and display OptiLink analysis results. These views are named Command, Summary,
Compare, Domains,
Pages, Links, Log, and Notes.
Third, the Start button which, as the name suggests, starts the OptiLink
analysis. When OptiLink is running, the Start button changes to the Cancel
button (shown below), which will terminate an OptiLink analysis. 
And lastly, the progress bar that provides a visual and numerical indication
of completion when the OptiLink analysis engine is running. When stopped,
as shown above, the progress bar is a uniform gray, but when running, as
show below, a blue progress bar is shown.
