Digitus Adapter DA70135 USB 2.0 Sharing Switch, 2 PC - 1 Device

USB 2.0 Sharing Switch, 2 PC - 1 Device? Corresponds to specification USB 2.0? Use one or two USB 1.1 / 2.0 devices with two (DA-70135) or four (DA-70136) PCs? Keyboard hot-key switching between the devices / PCs? Operating system support for Windows 98, ME, 2000, XP and MAC OS 9/10.x, Vista? No additional power supply required? Power supply via USB