Google has started to dismantle Picasa Web, and many features no longer work.
If you use Picasa Web, you should migrate away immediately.
BTW, my X display has nice overlay/multi-depth visuals of different color depths: e.g.
there are both depth 8 and 24 visuals available at the same time.
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Can I prompt the user at the local X display whether the incoming VNC client should be accepted or not? How about running an arbitrary program to make the decisions?