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IsChild()
Determine whether a window is a child or descendant of another window
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Syntax
IsChild( <hWndParent>, <hWndChild> )   -->   lChild

Arguments
<hWndParent> is the handle of the parent window.

<hWndChild> is the handle of the window that may be a child.

Returns
A logical TRUE (.T.) is returned if the <hWndChild> window is
a child or direct descendant of the <hWndParent> window.
Otherwise, FALSE (.F.) is returned.

Description
This function determines whether the window specified by the
second parameter is a child or direct descendant of the window
specified by the first parameter.  (A direct descendant is a
child, grandchild, great-grandchild, etc.)

Example
// this one is always false:
? IsChild( hWnd, hWnd )