osx man page for tk_focusprev

tk_focusNext(n) 					       Tk Built-In Commands						   tk_focusNext(n)

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NAME
       tk_focusNext, tk_focusPrev, tk_focusFollowsMouse - Utility procedures for managing the input focus.

SYNOPSIS
       tk_focusNext window

       tk_focusPrev window

       tk_focusFollowsMouse
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DESCRIPTION
       tk_focusNext is a utility procedure used for keyboard traversal.  It returns the "next" window after window in focus order. The focus order
       is determined by the stacking order of windows and the structure of the window hierarchy.  Among siblings, the focus order is the  same	as
       the  stacking  order,  with the lowest window being first.  If a window has children, the window is visited first, followed by its children
       (recursively), followed by its next sibling.  Top-level windows other than window are skipped, so that tk_focusNext never returns a  window
       in a different top-level from window.

       After  computing  the  next  window,  tk_focusNext  examines  the  window's  -takefocus option to see whether it should be skipped.  If so,
       tk_focusNext continues on to the next window in the focus order, until it eventually finds a window that will accept the focus  or  returns
       back to window.

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

       tk_focusFollowsMouse changes the focus model for the application to an implicit one where the window under the mouse gets the focus.  After
       this procedure is called, whenever the mouse enters a window Tk will automatically give it the input focus.  The focus command may be  used
       to  move  the focus to a window other than the one under the mouse, but as soon as the mouse moves into a new window the focus will jump to
       that window.  Note: at present there is no built-in support for returning the application to an explicit focus model;  to do this you  will
       have to write a script that deletes the bindings created by tk_focusFollowsMouse.

KEYWORDS
       focus, keyboard traversal, top-level

Tk									4.0							   tk_focusNext(n)