CustomScript is the template for the custom script.

HookScript is the default iPXE script for loading Hook.

StaticScript is the iPXE script used when in the auto-proxy mode.

Custom holds either a URL to chain to or a script to execute.

Hook holds the values used to generate the iPXE script that loads the Hook OS.

OSIE or OS Installation Environment is the data about where the OSIE parts are located.