void ShowAboutDialog(HWND owner)
LRESULT CALLBACK MainWndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
INT_PTR CALLBACK AboutDialogProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
BOOL RegisterMainWindowClass(void)
HWND CreateMainWindow(void)