It is listed as an option in the perldoc, but dosn't say what it's for.

True, "perldoc Tk::Listbox" only mentions the "exportSelection" option with the cryptic remark "(see exportSelection option)", and you have to know that this means "go to 'perldoc Tk::options'", where you'll find (in proper alphabetical order):

Specifies whether or not a selection in the widget should also be the X selection. The value may have any of the forms accepted by Tcl_GetBoolean, such as true, false, 0, 1, yes, or no. If the selection is exported, then selecting in the widget deselects the current X selection, selecting outside the widget deselects any widget selection, and the widget will respond to selection retrieval requests when it has a selection. The default is usually for widgets to export selections.

Update: Even with that, the option might still be hard to understand for people who use Perl/Tk without the benefit of an X-Windows environment (i.e. on MS-Windows systems) -- I guess such users wouldn't quite know what it means until they happen to guess that it might be worthwhile to try it out.

In reply to Re^4: simultaneous selections in Tk by graff
in thread simultaneous selections in Tk by momo33

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