How do you use your (ultra/wide) monitor/s?

Using a single ultra widescreen or multiple 16:9 or any other ratio monitors is now common even in office spaces must people are using at least two screens.

I wonder what is the setup for different HN readers. Being in software engineering or any other line of business. Some information that can probably be helpful for future searchers and readers:

- How many screens do you have? - What is aspect ratio of each screen? - What is your primary use of the setup?

As description please feel free to add your best practices, routines, etc. on how you maximise the usage.