Abstract: An arrangement for displaying a plurality of video images in multiple windows in a computer graphics system, is described. A CPU (Central Processing Unit) is coupled to a system bus and controls an overall operation of the arrangement. A frame buffer is provided to store one frame video image to be displayed on a display. A plurality of video data capture units acquire respectively a plurality of video images into the arrangement. A plurality of window pixel data transfer controllers are interconnected respectively between the bus and the video data capture units. The window pixel data transfer controllers are arranged to respectively define windows and arranged to respectively transfer the video images to the frame buffer by way of the corresponding windows. A given window pixel data transfer controller of the above-mentioned data transfer controllers is arranged to determine an exposed portion of the corresponding window in the case where the window is overlapped by another window.