you can use "xbindkeys" to bind any keypress to any program. I don't know 3ddesk, so I'm not sure what you mean by the phrase "to use it.", so if it's something different than running a program, please explain.
You might want to consider how you're going to input EOF to CLI-based programs (if you are hell-bent on rebinding C-d, that is).
hth --Jonas
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