confine pointer and keyboard events to a Tk window sub-tree
The Byzi extension for Tk provides a [byzi] command,
based on the Tk 8.6 [busy] command sources.

Keyboard, button and pointer events from Tk widgets can be blocked,
while overriding the widget's cursor with a configurable busy cursor.

Created to bring Tk 8.6 [busy] functionality to Tk 8.5,
the Byzi extension can be used with Tk 8.6 as well.

Maintainer: Stuart Cassoff <stwo@users.sourceforge.net>

WWW: http://github.com/aryler/Byzi
