Final answer:
Donald Usher and Eugene Windsor are not well-known historical figures with limited information available.
Step-by-step explanation:
Donald Usher and Eugene Windsor were not well-known historical figures. Therefore, there is limited information available about them in historical records or academic sources. It is possible that they are private individuals or individuals who have not made significant contributions to history. Without more context or specific information, it is difficult to provide a more detailed answer.