I am developing a collaborative environment that will read in applications from other systems using VNC, and they will be all placed onto a 30" display. The question is I want to be able to annotate 'on top' of VNC'ed windows. Now there is no interaction between the user of the collaborative environment and the users of the applications. I just want to basically draw lines, circles, rectangles and text on top of the VNC'ed windows. What would be the best way to go about this? We are going to be using either a Linux or Solaris OS. I have looked into openGL but the more I look into this it seems as if openGL is a little overkill for what I am trying to accomplish? Any direction would be appreciated?