System:Modules

From Aspen Documentation

Function Description
callModuleHooks Calls any modules that have been registered to load with the current module. This function is also called automatically when being run in application mode.
getAllNonBaseModules Returns an array of module GUIDs that are not part of the standard install, whether they're installed or not.
getNonBaseModules Returns an array of module GUIDs that are not part of the standard install. Only modules that been installed are included.
registerModuleHook Registers a module hook for the current module. Just provide the guid of the module to hook into, and your module will be loaded whenever the hook module is.