Master-IT USB+ uses breakthrough technologies which allow for flexibility and functionality never before seen in a KVM switch. The built-in USB DDM prevents interruptions in communication between shared devices and connected systems /computers. By DDM technology, switching ports without any lag time occurred can raise the efficiency and compatibility of KVM switch.UD-12-PLUS + embedded DDM Technology can 100% maintain the compatibility of the shared devices and connected systems. UD-12-PLUS + becomes the most reliable and robust DVI KVM switch in the world and features full Windows 7 compatibility. Currently DDM Technology can be implemented for USB HID class devices only, but in the future will be expanded to cover all major types of USB devices.