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You can select any of 16M colours on AGA or Modern RTG (Old RTG had limits of 6bits per colour, you monitor might still be limited to 6bits per RGB, most cheap LCDs even today!)
Now you have a palette of 256 pens that you can assign any colour that is required by your software, and it can then change this pen if required at any time. This is very similar to pallet based 8bit screens. The only advantage of HiColour screens, is you can use direct drawing to display any colour at any time, but you can't modify it after. But you can modify any of the 256 pens and they wil change everywhere on screen, where they are in use. By the way, windows defined only 16c in the past, the rest was a locked palette for dithering.
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