I get you now.
The outgoing set of wires is the neutral/hot combo which gives electricity to the other outlet on the circuit. In this case, the outgoing wires are the top two.
Notably, whoever had wired this outgoing/ingoing outlet had the neutral and hot pairs reversed, says my outlet tester.
So the ingoing wires to the outlet behind my bed are now connected to the outlet. The outgoing wires which don't work, prohibiting use of the outlet under the window, will be taped and capped off.
One last question. Since the outlet beneath the window no longer works, do I need to tape and cap those wires as well, or, since there is no electricity going to it anyway, can I simply leave that outlet hooked up and just not use it?