This is the scripting startup folder. In here you can place scripts that you wish to execute at startup of the application. They are executed after the application is initialized, but before all the AEGP's and GP's are initialized. Scripting shares a global environment, therefore any script you execute at startup can define functions and properties that are available to all scripts. Defining a function in a startup script will make it available to all other scripts. You can also embed properties in existing object like app if you want to magically extend the application for other scripts.