What is a virtual machine? like a thin client set up for the exam rooms? I have not started using AC yet, plan to open in a few months but am planning on using it. does this mean any one user cannot open multiple charts at once or throughout the whole system ie front desk, MA putting in a patient while am seeing another one etc, I can't imagine that is the case but wanted to clarify, seems like a pretty important piece of info that I haven't come across yet during my research. thanks. Mike