Using the actual device with touch as a sort of control pane and the 2nd screen (expected to be larger. Maybe 24”-60”+) while the 2nd screen acts as the workspace.
Essentially the touch screen becomes a way to manipulate everything via the “mouse” and on screen keyboards.
There is the issue of being unable to use the touch screen without looking. Maybe keeping the touch device at an angle would help. Or other devices such as bluetooth keyboards, screen-less tablets, and etc. could be used.