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1) Tcl/Tk is very very easy to learn (and to embed in C applications)

2) I've never implemented my own widgets but plenty of people have, check out BLT as an example

3) I don't know what Enso is I'm afraid.

OOPS I forgot to give the link. It is a startup by Aza Raskin and his friends. The link is http://www.humanized.com Even if you don't use it do check out the demo. It's nice.

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