1/ What should I have to do to be able to play videos on-line?
In most cases the video should play without any additional steps to be done. We use the same technology as for example YouTube. If you can't play the video, ensure that you have the latest version of Flash Plugin installed in your browser. Flash Plugin is now availaible for a couple of platforms including Windows and Linux.
2/ How does the HQ on-line video works?
HQ video uses H.264 video codec which enables to create high quality videos at relatively small file sizes. If you want to play these videos, you'll have to install the latest Flash Flayer.