It's not possible to control two cameras within a single run with ACP. However, you can set ACP, MaxIm, and FocusMax up for one or the other camera. Get everything going for one camera, then save profiles/configurations in all three programs, Then get everything going for the other camera, and again save profiles/configurations. Now you can switch between the two configurations in less then one minute, and be able to start runs with one OR the other.