A method and apparatus for allocating memory space in main memory of an associated processor for a plurality of windows. The depth in each window is independent of other windows on the display and can be changed dynamically. An application program is not required to know the frame buffer depth in advance....http://www.google.co.uk/patents/US5388201?utm_source=gb-gplus-sharePatent US5388201 - Method and apparatus for providing multiple bit depth windows
