selection - Manipulate the X selection

http://www.purl.org/tcl/home/man/tcl8.4/TkCmd/selection.html

'''selection''' ''option ?arg arg ...?''
Supported subcommands are:
'''[selection clear]''' ''?-'''''displayof''''' window? ?-'''''selection''''' selection?''
    :   '''[selection get]''' ''?-'''''displayof''''' window? ?-'''''selection''''' selection? ?-'''''type''''' type?''
'''[selection get]''' ''?-'''''displayof''''' window? ?-'''''selection''''' selection? ?-'''''type''''' type?''
    :   '''[selection handle]''' ''?-'''''selection''''' selection? ?-'''''type''''' type? ?-'''''format''''' format? window command''
'''[selection handle]''' ''?-'''''selection''''' selection? ?-'''''type''''' type? ?-'''''format''''' format? window command''
    :   '''[selection own]''' ''?-'''''displayof''''' window? ?-'''''selection''''' selection?''
'''[selection own]''' ''?-'''''displayof''''' window? ?-'''''selection''''' selection?''
    :   '''[selection own]''' ''?-'''''command''''' command? ?-'''''selection''''' selection? window''
'''[selection own]''' ''?-'''''command''''' command? ?-'''''selection''''' selection? window''

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Can someone write up some text distinguishing the terms for 'inter-widget text highlighting for copy/paste purposes' and 'user initiated indication of widget component indication' - in other words, distingushing the concept of 'selecting text in a text widget or whatever' vs 'selecting listbox items'...
** Documentation **
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See also:

   * [clipboard]
   * [label selection]
   * [listbox selection]
   * [Primary Transfer vs. the Clipboard].

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