Running and controlling TeX ! Usually, all you will ever need is a single `texrunner` instance which controls a single running TeX or LaTeX instance at a time. To make life easy to our users..., such an instance is created automatically upon startup and its called the `defaulttexrunner`. Whenever you use the function shortcuts like `text.text()` and in particular `text.set()`, you are accessing this `defaulttexrunner` instance. Also, the shortcut method `text` of any canvas instance uses this `defaulttexrunner` by default. !! However, it is possible to create several texrunner instances. In this example, we are using two of them. To make it a little more interesting, we instruct the `defaulttexrunner` to use LaTeX, while keeping TeX for the `plaintexrunner` instance. It is you turn to try expressions valid in TeX or LaTeX only at the different `texrunner` instances. !! Note that you do not have to worry about mixing the results of different texrunners into a single output. Even the embedded fonts in the output are shared. You can, by the way, also restart a `texrunner` instance including the `defaulttexrunner` and change its configuration on that occasion.