How to use IDCAP command

I’m expecting a response like “that’s not where you should ask that kind of question”, but anyway. I do not know where to use the IDCAP commands. Do I use them in a JS file ? Or do I need to install an app that will send the command to the TV for it to execute them ? Unless I need a command prompt and send them with something like cURL ? (in that case I have no idea what port should be use)
I thank you in advance for the answer, even if it’s one that just tell me that it’s not here that I should ask that question.

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