 The previous operating system would still maintain its existing references to all devices and files, but nearly anything, including hardware interrupts, requests for data and even the system time could be intercepted (and a fake response sent) by the hypervisor.The original concept of Blue Pill was published by another researcher at IEEE Oakland on May 2006, under the name VMBR (virtual-machine based rootkit).Joanna Rutkowska claims that, since any detection program could be fooled by the hypervisor, such a system could be "100% undetectable".