Here you define the style for the newly defined language. This also belongs in the preamble of your LaTeX file.
The colours are just an example, read how to define more colours in the wikibook.
Now you can insert code like this. The example is nonsense, I tried to include as many keywords as possible. The medskip command before the listing inserts a linebreak, a not very nice way to have some distance between the text and the listing.
The result looks like this:
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