I heard about it 7 or 8 years ago from people who had been to Xerox Parc and Cambridge (UK) based Xerox Research Centres. I can find this research paper online

I heard about it 7 or 8 years ago from people who had been to Xerox Parc and Cambridge (UK) based Xerox Research Centres. I can find this research paper online, although it appears to be dated 1995. It's not exactly what I was told about, but it seems to be an earlier version. http://books.google.co.uk/books?id=gjm6FpMUTXgC&pg=PA509&lpg=PA509&dq=Xerox+Whiteboard&source=bl&ots=Rh6AtCrPtN&sig=T7-HqMSPL1mPq1av4D1R2G5xIVk&hl=en&ei=y_x_SqqbKcirjAfa7czwAQ&sa=X&oi=book_result&ct=result&resnum=3 http://books.google.co.uk/books?id=gjm6FpMUTXgC&pg=PA509...