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> My hypothesis of what is happening is that when you're resting your arms on the table, you are preventing the free flow of blood in your forearms to your hands.

If this is what's happening, perhaps taking up indoor rock climbing would help. I know of no better exercise for improving the body's ability to send blood to the forearms and hands than rock climbing since so much of it depends on grip strength. Failing that, there are grip strength training devices (example...not suggesting this particular one: https://www.amazon.com/dp/B00HB7V6KS) that he might keep by his desk to use when he starts getting cold fingers.

> A good short term solution is to fill a paper cup with hot water and wrap your hands around that. This provides temporary relief but only treats the symptom. The effect wears off quickly.

+1 for that. Where I work there's a central cooling system at it gets very cold around where I sit. So I periodically grab some hot tea and hold the cup to help heat my hands.

I too do some walking to help increase body temperature and blood flow. It alleviates the symptoms somewhat.

When I work remotely from home, I use a stand up desk setup. I've found that I don't get the cold feeling when I do this.

Much appreciate your input. I noticed the exact same thing, but it also happens when I put my keyboard in the lap. My theory is that it's due to the impact of my fingers on the keys that "tease" the flow to slow down.

Pick a more expressive language. Less code will mean less arms on the table. All kidding aside, exercise will have benefits on all levels.