Sony VAIO VGN-AR500 Series User Manual page 59

If you are using a cable or satellite set-top box, you can attach the remote sensor control to the remote sensor, which enables
you to control the set-top box with the remote commander.
To connect the remote sensor control
1 Plug the cable from the remote sensor control (1) into either jack (1 or 2) on the back of the remote sensor (2).
2 Remove the adhesive tape cover from the bottom of the remote sensor control (1).
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Using Your VAIO Computer