if (!abtbox) { abtbox = CreateDialog (hinst, MAKEINTRESOURCE(IDD_ABOUTBOX), hwnd, AboutProc); ShowWindow (abtbox, SW_SHOWNORMAL); }
DialogBox(hinst, MAKEINTRESOURCE(IDD_ABOUTBOX),hwnd, AboutProc);
void showabout (HWND hwnd) {    if (!abtbox) {	abtbox = CreateDialog (hinst, MAKEINTRESOURCE(IDD_ABOUTBOX),			       hwnd, AboutProc);	ShowWindow (abtbox, SW_SHOWNORMAL);    }}