vWindow win = (vWindow)a;
vWindow win = (vWindow)a.Deref();
    public vDescriptor Call(vDescriptor a, vDescriptor b, vDescriptor c) {	if (!a.iswin()) {	    return Call(k$window.getWindow(), a, b);	}	vWindow win = (vWindow)a;	long row = b.mkInteger().value;	long col = c.mkInteger().value;	win.getTTY().Row(win, row + "");	win.getTTY().Col(win, col + "");	return win;    }