...is absolutely incredible. "But why? They are just terminals!", some wise newbie would say now ;) Well, the interesting thing about "Terminals" (with this, I don't just mean computer terminals, also hellish installations, flesh-textures, spine, marble-ornaments; just "complex textures/sectors included (or excluded) about 8-32 pixels into (out of) a plain wall (or even floor)") is the fact, that they are some kind of "emergency solution" for advanced mappers. Why? You can add them always, and if I say always, I mean it! If you don't have any creative or innovative ideas for some new areas of your map, add "Terminals" :) It always works and looks good!

Shot 1 demonstrates this usage very well. I really hadn't andy good ideas while developing this room, so I just thought about adding some computers. On the left side, you can see an excluded complex machine (with a border ;)), in front of you, you find another computer in the wall with ligh and a sloped PLAT flat and finally at the top of the screenshot, you see some very long COMP texture below the sky window. They are everywhere but no-one minds and everyone likes it, because it looks like detail ;) (buildtime 10-20 minutes extra time)

In shot number 2 you can see a more simple usage of this feature. The upper balcony on the left side would look very empty if I just left it with its plain STARTAN texture. This is why I added some computer panels which aerates the whole thing a bit. (build time 5-6 minutes)

The last shot numbered 3 demonstrates once more the easier and faster terminal work. You can see a simple COMPSTA monitor at the wall in front of you (just one sector, though detail) and also some machines at the top with lights (and border once more). It is really not much work done, just 3 new sectors, but the room looks much better (although this one still lacks of detail in my eyes, but it is under developement as I write).

Summary: As already mentioned, if you lack of creative ideas for your areas, add "Terminals", they fit always, are easy and fast to do and look great! And don't forget the following explanation from the top: "[..]with this, I don't just mean computer terminals, also hellish installations, flesh-textures, spine, marble-ornaments; just "complex textures/sectors included (or excluded) about 8-32 pixels into (out of) a plain wall (or even floor)[..]" and now go and add terminals :)
Extra-Buildtime: "5-30 minutes" (depends on the complexity of the machines and the level of copy&pasting)
Build-Difficulty: "Low - High"