Disclosed is a support architecture that facilitates use of display device drivers containing a minimum of hardware-specific software code. A driver need support only a relatively few common functions, which act as building blocks for the larger, more complex operations typically requested by graphics...http://www.google.ca/patents/US5687376?utm_source=gb-gplus-sharePatent US5687376 - System for monitoring performance of advanced graphics driver including filter modules for passing supported commands associated with function calls and recording task execution time for graphic operation 
