Tk_HWNDToWindow - Find Tk's window information for a Windows window
SYNOPSIS
#include <tkPlatDecls.h>
Tk_Window Tk_HWNDToWindow(hwnd)
ARGUMENTS
HWND hwnd (in)
Windows handle for the window.
DESCRIPTION
Given a Windows HWND window identifier, this procedure returns the corresponding Tk_Window handle. If there is no Tk_Window corresponding to hwnd then NULL is returned.