Understanding foreign variables

`ftd` gives a way for its platform, `fastn`, to define some variables known as `foreign variables`. These variables, then, can be used in the `ftd` code whose value is provided by the platform. This gives `fastn` power over `ftd` to define its own variables. `fastn` has one such foreign variables called `assets`. Each `fastn` package has a special module, [assets](import/#import-special-modules), importing which you get access to its variables. These variables contains the reference to the files or fonts defined in the package. The file referring variables are foreign variables, while, fonts are simple variable. For more information, please visit [assets](assets).