Installing components to a host database is a pretty straightforward process. All you need to do is put the component inside the "Components" folder and it is ready to be used. But what happens when the component uses a component, acting as both a component database and host database?

Putting a sub-component into the component database's "Components" folder does not work. 4D returns a syntax error when trying to execute a method from a sub-component: "The method is not found".

There can be only one level of "Components" folders, but a component database in that folder can access methods of all the other components in the same folder. Therefore, to avoid this problem, all sub-components must be included into the host database's "Components" folder.