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If it worked from anywhere in the house then it must have been a low or high radio frequency. To be a universal remote and have that functionality when interfaced with old remote recivers it would be two parts. One would be the remote with the radio signal output and the other, a stationary object that pointed at the reciver (tv, vcr, etc.) for outputing infrared but also recived the radio signal broadcast from the remote. What that object would have to do is translate the individual radio frequencies to the individual infrared signals (which are offset from eachother in such a way that the starting point- i.e. the "code" that must be programmed for output- has different signals seperated much like we see in game hacking [ .001-power, .002-ch up, .004- ch down, etc.]). This is also why different infrared remotes typically don't overlap; The starting points can something like .1201 or .12019. Of course none of this is accurate for actual numbers or inner workings, it's just an example.
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