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KVM switches allow a single operator to control multiple computers and they have evolved from patch panels and mechanical switches to digital KVM switches and KVM over IP devices. However they all involve some hardware switch device. The notion of "virtual KVM" involves using software to route the operator's Keyboard output, Video input, and Mouse output to/from the target computer - over the IP network.
KVM hardware was developed as a console switching technology way before smart thin client tools such as ICA, RDP and VNC were developed. These software tools are now mature, offering high-quality low-bandwidth graphical transfer. Digital KVM converts analogue video into digital, introduces errors/noise, jitter and so on. It cannot make use of the screen transfer intelligence built into ICA, RDP and VNC clients so it demands heaps of bandwidth and introduces far more latency. In addition KVM does not do any logging or reporting on the data as there is nothing machine readable in graphical bit maps.
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