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I ticked 'other' as in some applications I developed (industrial quality control) most of the interaction is done through measuring arms and remote inputs (buttons)
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I would think of bar code reader, fingerprint readers, readers for magnetic stripe cards and smartcards, ... In the IoT-world you do I/O through sensors, actuators - or, from the other end of the chip: Bluetooth (or other radio protocol).
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Throwing the device at the wall? 
If you have an important point to make, don't try to be subtle or clever. Use a pile driver. Hit the point once. Then come back and hit it again. Then hit it a third time - a tremendous whack.
--Winston Churchill
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Footpedals, palm stations. We also use custom hardware buttons, some of which illuminate during use.
There were build errors.
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Barcode readers
Nurse Call Buttons (to signal an immediate action)
Foot Pedals
Joysticks
Pressure Sensors
Do you guys only work in offices?
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Buttons hard-wired to the I/O pins of the processor. I'm living in the embedded world now.
But even in the olden C# days were there dedicated PCI(E) I/O cards to have buttons or position indicator switches attached to the PC.
Or they were dangling from a parallel port.
Once even an RTS/CTS signal line had to do the job.
Ciao,
luker
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APIs.
Setting values in a database.
I've also worked on automated toll systems -- the "users" drive their vehicles through sensors in the road, etc.
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