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ShowWindow           Display Or Remove Window

BOOL ShowWindow(hWnd, nCmdShow)
HWND hWnd;
int nCmdShow;

                        nCmdShow
                |--------------------|
                | SW_HIDE            |
                | SW_MINIMIZE        |
                | SW_RESTORE         |
                | SW_SHOW            |
                | SW_SHOWMAXIMIZED   |
                | SW_SHOWMINIMIZED   |
                | SW_SHOWMINNOACTIVE |
                | SW_SHOWNA          |
                | SW_SHOWNOACTIVATE  |
                | SW_SHOWNORMAL      |
                +--------------------+

Returns:    Previous state

Note:           ShowWindow may be called only once with the
                nCmdShow parameter from WinMain.