value = w; return this;
	public vVariable Assign(vDescriptor v) {	// assign	    vValue w = v.Deref();	    if (w.iswin() || w.isnull()) {		value = w;		vWindow.setCurrent((vWindow) value);		return this;	    } else {		iRuntime.error(140, w);		return null;	    }	}