Triple monitors + T470s: yes you can

If you happen to have a Lenovo T470s and a USB-C dock with a single HDMI output, it seems Windows 10 can cope with driving twin external displays: one over the dock, and one on the laptop’s own HDMI port. This is in addition to the laptop screen, although my particular monitors aren’t HD.

Update: don’t unplug the connections after suspending the laptop, or the internal display won’t work when you wake it up again!

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