XView (https://en.wikipedia.org/wiki/XView https://en.wikipedia.org/wiki/XView) was a really great way to write GUI applications from C programs. It extensivel

XView (https://en.wikipedia.org/wiki/XView https://en.wikipedia.org/wiki/XView) was a really great way to write GUI applications from C programs. It extensively (ab-)used varargs: frame = (Frame)xv_create (NULL, FRAME, FRAME_LABEL, argv[0], XV_WIDTH, 200, XV_HEIGHT, 100, NULL); panel = (Panel)xv_create (frame, PANEL, NULL); (void) xv_create (panel, PANEL_BUTTON, PANEL_LABEL_STRING, "Quit", PANEL_NOTIFY_PROC, quit, NULL); xv_main_loop (frame);