Steve,

A SetupBuilder "Core" PreRequisite is an include script (.sbi) that contains the deployment logic and the original vendor files (runtimes or redistributables) needed to install distinct pieces of functionality for a product or technology framework. For example, Microsoft Visual C++ 2012 Redistributable.

To develop your own PreRequisite, just add the required deployment logic for your own components to a .sbi and add it to the main (.sb8) project via the #include compiler script item. As a starting point, you can use one of the standard "Core" PreRequisite include scripts. But you do not have to follow this model at all!

It is not mentioned in the Help or the PDF manual because a PreRequisite is nothing more than deployment logic code (whatever steps are required to deploy a specific component). It can be a PreRequisite that downloads a missing component from the Internet and installs and registers it, or it can be a redistributable that is embedded into the setup.exe and extracted/installed. Or a single-line PreRequisite to just install/register a single ActiveX component.

Friedrich