- HTML Admin-Manual
- PDF Admin-Manual
- HTML ITSM-Manual
- PDF ITSM-Manual
- HTML Developer-Manual
- PDF Developer-Manual
- HTML Developer-API
Chapter 3. Architecture
The OTRS framework is modular. The following picture shows the basic layer architecture of OTRS.

3.1. Directories
| Directory | Description |
|---|---|
| bin/ | CMD programmes |
| bin/cgi-bin/ | web handle |
| bin/fcgi-bin/ | fast cgi web handle |
| Kernel | modules |
| Kernel/Config/ | config |
| Kernel/Config/Files | config files |
| Kernel/Language | language translation |
| Kernel/System/ | core modules, e.g. Log, Ticket... |
| Kernel/Modules/ | frontend modules, e.g. QueueView... |
| Kernel/Output/HTML/ | html templates |
| var/ | variable data |
| var/log | logfiles |
| var/cron/ | cron files |
| var/httpd/htdocs/ | htdocs directory with index.html |
| var/httpd/htdocs/images/Standard/ | icons and pictures |
| scripts/ | misc |
| scripts/test/ | test files |
| scripts/sample/ | sample files |

