piferal
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That is what these are for. You set these on top of or under the receiver, around where its IR sensor is for where it picks up signal from the remote control. This way, a central controlling device can send signals to other devices via remote control, i.e. this device tells the tv to turn on and the dvd player to start playing when you push play on the controlling device's remote. This way, you can control a wide variety of devices with a single remote.
Yes, indeed this is another of the uses that can be given, or both at the same time.
And I could not have explained better than you with my academic English hahaha