Switching host and slave computers in Mouse without Borders

I've tried to reload the software several times can't seem to make my lenovo the host computer.
Please help...

Greg

Instead of using Mouse without Borders (which has been abandoned many years ago with some serious bugs never having been fixed), use Input Director. Input Director is still actively maintained, has a much wider range of features and flexibility, and, there also still exists an active Google discussion for community support led by the author who wrote the program.