Bwidget Source Code
Help: editor
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Bounty program for improvements to Tcl and certain Tcl packages.
Tcl 2018 Conference, Houston/TX, US, Oct 15-19
Send your abstracts to tclconference@googlegroups.com
or submit via the online form by Aug 20.

The "editor" setting:

The value is an external command that will launch the
text editor command used for check-in comments.