Forum OpenACS Q&A: Re: Re: Re: What does add-folder really do?

... OK, so if I add a folder in the internal representation, then I can either mount a new app there ...

Yes

... or make a dir in the www/ tree of the filesystem that can hold .html, .adp and other random content?

You don't need to create further nodes under your mounted application to access its directory tree: simply refer to any content with the corresponding url.