+SAC enables you to connect to your running OS through a serial port. When you open a Command Prompt window in SAC, `sacsess.exe` starts `cmd.exe` within your running OS. In Task Manager, you can see that if, at the same time, you also connect through RDP to your VM, you're now connected to SAC through the serial console feature. The CMD window that you access through SAC is the same as the `cmd.exe` window that you use when you connect through RDP. All the same commands and tools are available, including the ability to start PowerShell from that CMD instance. The major difference between SAC and the Windows Recovery Environment (WinRE) is that SAC lets you manage your running OS, but WinRE starts up into a different, minimal OS. Although Azure VMs don't support the ability to access WinRE, they can be managed through SAC.
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