The package deals with sending stuff to the screen for users to debug.
The operations included here:
- on Activate trace invokations globally.
off Deactivate trace invokations globally.
do Send a message to the screen depending on global settings.
yes Send a message to the screen no matter the global settings.
no Don't send a message to the screen no matter the global settings.
boot Activate the package. This is done at package require time.