The 10D and 300D both use the BP511 battery. The AC adapter uses a dummy battery to interface to the camera, so there is no external port for connection of the AC supply. the AC adapter is now an option, however, as Gordon pointed out.
I know the 10D can be controlled from a computer, I can't say for the 300D. the Canon Remote Capture utility appears to ship with the 300D, so that would say "yes", apparently.
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