I still think you could have two VMs on Hyper-V on 2012. They will ultimately have connections via virtual NICs making virtual switch.
On desktop you could have NO VM and one AC. Then change paths each time. If you set up the change path right (my way, lol), it's pretty fast. Besides the red message, the other doctor and staff are going to notice their patients aren't there. I am sure you could get some HIPAA note that covered the other staff if they go in by mistake.
Sandeep, would one of the log files record who went into what AC?
