...
autorun.brs is the generic name for a file the BrightSign Operating System (BOS) searches for on the player’s configured storage device (see Image 1, below). If an autorun.brs is found, the player will execute it. It is the entry point for any application developed on a BrightSign player, and it can handle the entirety of an application (BrightAuthor:connected), be a simple pointer to more complex programs (JavaScript applications), or any mix of the two.
The BrightSign autorun.brs also configures the player. Many player setup/configuration options must be set up immediately (such as SSH, logging level, some network interfaces, registry settings, video decoder routing, etc.). These settings are unique to media players, and because the autorun.brs is the first thing the player executes, it is the best (and sometimes only) place to set them.
When creating a JavaScript application or presentation, the autorun.brs will typically configure the player, instantiate an HTML widget, and give the HTML widget the correct HTML file or URL. The HTML widget will then take over and run your JavaScript files.
...