As far as the tags are concerned, all you have to do is come up with an image that you’ll use exclusively for that tag. It can be a person, an animal, or a thing.
All .wav files can be Sylvester Stallone, or a zebra, or an ashtray. And then you fit it into whatever it’s supposed to remind you of.
Any mp4 file can be represented by Michelle Pfeiffer (MP).
Apply this to any constant, anything that you’ll encounter on a regular basis.
Remember, these images aren’t “implemented” in loci. You simply “set them down” into a locus. You “place” them there. So that when you walk through your palace, or your journey, you’ll see the image “on” your desk, or “in” your bathtub, or “on” your stove, or “in” your fridge, or “on” your doormat, or “in” your driveway, or “in front of” that house or store.
If you regularly come across HTML, you have a choice. You can come up with a four-word phrase, each word beginning with H, then T, then M, then L. Remember one of those phrases you used in order to recall the order of the planets? My Very Educated Mother Just Served Us Nine Pizzas.
Or you can come up with a single image that you’ll use only when HTML is necessary to remember. An image that has nothing logically to do with the letters HTML, but an image that you use only for it. Again, a person, an animal, or a thing. Every time you see your cousin’s image, you know it’s an HTML you’re remembering. Or a pet you used to own. Or a type of car. Or a weapon. Then all you have to do is work that image into the thing you want to remember.
The best images (person, animal, thing) are those you come up with for yourself. This way, it’ll be natural for your mind to recall it, since it originated within you. Of course, we all use images other people have suggested, but not all the time. When you come across a word or a concept, ask yourself, “Why don’t I just represent this with a specific, constant image? Any image will do, so long as I use it only for that word/concept.”
All of this is more or less spelled out in Loryane’s and O’Brien’s books.