It would be useful to reflect the application state (running/finished) on the
toplevel tabs - by changing the font color, adding '(finished)' label etc. This
way the user will be notified about termination of an application which is
opened but not currently focused.
Also, the opened applications should be higlighted somehow in the Applications
tree (bold font, different color etc.) and probably the currently opened and
focused application should be highlighted as well.