Mercedes Benz Wis Service/repair System

I AM TRYING TO FIND OUT EXACTLY WHAT THIS SYSTEM IS, WHAT IT DOES, WHAT YEARS AND MODELS IT COVERS, THE #OF CDS IN THE SYSTEM, HOW THE SCREEN IS LAID OUT(A PICTURE WOULD BE WORTH A THOUSAND WORDS), AND THE HARDWARE AND SOFTWARE REQUIREMENTS. ANY AND ALL INFORMATION WOULD BE GREATLY WELCOMED, ESPECIALLY FROM THOSE WHO OWN IT OR HAVE USED IT. NOTE:I AM ASKING ABOUT THE US VERSION OF THE ABOVE SYSTEM. THANK YOU!