There's more…

The output of these tools can be fed back to the installer or to the system at any moment with the preceding steps. Notice that there are some system aspects that are not necessarily controlled by debconf options. For example, the contents of your Apache or MySQL configuration files are mostly edited manually and don't get registered in debconf.

Debian's online documentation and reference manual contain deep references to several preseeding options as well as large preseeding files that you can edit: