Undocumented functions

Hello,
When toying with the console i found some undocumented function i had troubles to understand how i could make the best of them, could you please provide help regarding thoses ?

System.assert
Internal.run_with_activation_context
System.msi_get_component_path
System.get_env
System.track_parent

The last one looks especially promising because i have a tremendous amount of dependencies to dig in.

Thanks !