http://www.patents.ibm.com/details?pn=US04823108__&language=en It looks like it has a priority date of 1984-05-02. I'm not entirely sure what, exactly, it covers. It seems to cover a machine with a windowing system running applications that write into "pseudo-screen buffer memory", and periodically diffing the real window with the "pseudo-screen buffer" and writing the changes onto the real window. But it's written in patentese. It issued 1989-04-18. -- <[EMAIL PROTECTED]> Kragen Sitaker <http://www.pobox.com/~kragen/> This radically anti-cynical approach to life is not just a shared disposition but also an act of conscious dissent. -- Alan Bershaw, on the attitude of Jewel fans ("everyday angels")
