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If your receiver supports it and if your HTPC has a serial port, a serial cable can be used as a control interface. Serial connections don't have the necessary throughput to send or receive a video stream, so you'd need a separate one for that.
IR Blaster is the more common method of control because many set top boxes either don't have a serial port, or have it disabled by the provider.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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