Once upon a time there was a Blit terminal [1], which allowed processes to display content in independent windows. One process managed the windows, others coul

Once upon a time there was a Blit terminal [1], which allowed processes to display content in independent windows. One process managed the windows, others could draw only in own windows; the terminal took care of that. In an ideal future, GPU could be extended to support concurrent access from several processes, each with own context. The GPU would enforce separation; each process would draw to own window. Without going through syscalls... ---- [1] http://en.wikipedia.org/wiki/Blit_(computer_terminal) http://en.wikipedia.org/wiki/Blit_(computer_terminal)