http://www.thedelphigeek.com/2015/10/updating-progress-bar-from-parallel-for.html


http://www.swissdelphicenter.ch/torry/showcode.php?id=1887



http://delphi.about.com/od/kbthread/a/thread-gui.htm



http://stackoverflow.com/questions/15782823/how-to-update-progress-indicator-from-a-second-thread