Assuming you're connecting to a computer on the same network, you can ignore the section for External connections. The section for Remote Desktop port shows the default port to listen for and accept a remote connection. Click the back arrow to return to the previous screen and scroll through the Remote Desktop settings.
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While establishing a remote desktop connection between two computers on the same operating system is usually done with an easy, single-step solution using a Windows remote desktop tool, this alone is limited to quick tasks or simply retrieving files from another desktop. Indeed, the restrictions of this feature render it impractical for use as a primary remote connection tool.