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desk.cpl

Desktop Settings Control Panel, for example to change the screen resolution or primary/secondary monitor.
This dialog can also be opened on the command line with 
start ms-settings:display
More traditionally, this dialog is also opened by with a mouse right click on the desktop and then choosing Display Settings.

Multiple displays

Apparently, the options that are found in the listbox below Multiple displays can somewho be triggered from the command line with DisplaySwitch.exe.

See also

Some settings seem to be stored in the registry under HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\GraphicsDrivers\Configuration\_id_.

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