Changing a Richtextbox caret in C#

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This old bit of code from 2004 is an unfinished (i.e. not that pretty to read) demo project for changing the caret in a rich text box. It was the beginnings of a kind of console host for C#.

It shows a telnet style shell, a block caret, tab completion and a few other features. Type "prog" and then hit tab to see an example of the tab completion.