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HideCaret()
Make sure the caret is not displayed
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Syntax
HideCaret( <hWnd> )   -->   nil

Arguments
<hWnd> is the handle to the window that owns the caret.

Returns
NIL.

Description
This function hides the caret only if the specified window
actually owns it.  Note that HideCaret() maintains a count of
the number of times it has been called without a subsequent
ShowCaret(), and the caret remains hidden until this count is
zero (i.e. until the same number of ShowCaret() calls).

Example
HideCaret( hWnd )             // now hidden
HideCaret( hWnd )             // still hidden
ShowCaret( hWnd )             // still hidden (count still 1)
ShowCaret( hWnd )             // visible again