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 METHOD lValid CLASS TWindow
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Syntax:
   TWindow:lValid()  -->

Purpose:
The lValid() method will check to see if the ::bValid instance variable, when
evaluated, returns .T., and returns the result. If there is no code block in the
::bValid instance variable lValid() will just return .T.. This method will NOT end
the window, it just checks the ::bValid codeblock (if defined). To end a window use
the End() method