Tryton is a three-tiers high-level general purpose application platform under the license GPL-3 written in Python and using PostgreSQL (or sqlite) as database engine.
As root or using sudo, edit the file /etc/trytond.conf
Here you will find options which you can uncomment and fill out as necessary.
Next, as root, create the directory /var/lib/trytond, and chown it so that the trytond user can access it.
Now you can launch trytond and the tryton client.
Run /etc/rc.d/trytond start as root, and then launch tryton as a regular user.