/usr/share/doc/iwidgets4-doc/demos/shell is in iwidgets4-doc 4.0.1-6.
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# DEMO: selectiondialog in [incr Widgets]
# ----------------------------------------------------------------------
package require Iwidgets 4.0
iwidgets::shell .sh -modality none -padx 20 -pady 20 -title Shell
pack [label [.sh childsite].l -text SHELL]
.sh center
.sh activate
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