Utility procedure for managing the input focus.
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http://purl.org/tcl/home/man/tcl8.4/TkCmd/focusNext.htm

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**Manual**
'''SYNOPSIS'''

    :   '''tk_focusPrev''' ''window''

'''DESCRIPTION'''

'''tk_focusPrev''' is similar to '''[tk_focusNext]''' except that it returns the window just before ''window'' in the focus order.

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**See also**
   * [focus]
   * [tk_focusNext]
   * [tk_focusFollowsMouse]
   * [tk_menuSetFocus]
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