Using Remote Desktop to connect to different computers behind same IP
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You can configure the port which each remote desktop is listening to. Change the port here for computer A and B:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\TerminalServer\WinStations\RDP-Tcp\PortNumber
Forward the ports to the corresponding computers.
When you are connecting just specify the port:
7x.8x.1xx.2xx:23678