My ideas are usually brain based, hormones might come into it too.
The few cases when I was collecting and ordering items for an article, I used pen and paper in the early 2000s, Word docs more recently: handy for reordering them, assembling them from words and phrases into full sentences and paragraphs.
When I have an idea for software I'm developing, it goes onto a slip of paper. There's a dedicated box into which those slips go.
When/if my computer has ideas, I don't know what he/she does with them.
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