The states say a modular version of Windows, allowing features like the Internet browser and media player to be removed, would help level the competitive playing field for non-Microsoft software. But Microsoft has insisted that Windows is highly dependent on all its parts to work properly. Under a proposed settlement reached with the Justice Department in November, Microsoft would let computer makers hide desktop icons for some Windows features, but not remove the underlying computer code. Professor Bennett was the last of more than 30 witnesses who have testified before Judge Colleen Kollar-Kotelly of Federal District Court during 32 days of hearings. There will be arguments on motions in the case next week, but closing arguments are not expected until June. Judge Kollar-Kotelly is also weighing whether to approve the proposed settlement with the Justice Department that the nine dissenting states say is too weak to prevent future antitrust violations. The settlement has been endorsed by nine other states.