Please see the context from this blog of Joel Spolsky:
Since you have to poke at Windows Calculator with a stick, it doesn't
have to be as fast as Excel.
What does he mean by poking with a stick ? Does it mean it is not used often or something ?
Learn English – What does poking with a stick mean
idiomsmeaningmeaning-in-contextphrases
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Best Answer
The difference between Windows Calculator and Excel is that Windows Calculator is designed for interactive use only. It performs calculations only when you push its buttons. Whereas Excel is programmable: it can be instructed to perform a long series of calculations without needing user interaction for each one.
So Joel is analogising pressing the buttons in Windows Calculator (which is what you have to do each time you want to make it calculate) with poking things with a stick. I think the intended image is of someone poking an animal (or, as suggested by petemoloy, a stuck mechanism) with a stick in order to make it move.