{DocCenter: \TeX{}ing 11 million documents a year} {Joachim Schrod} {The talk is an experience report about DocCenter, a product of our company Net \& Publication Consultance GmbH (NPC). The report is about one of our reference customers, the online bank 1822direkt, where we handle all typeset written communication with \TeX. It differs from other \TeX\ use cases in that we don't have to create long complex documents, but small simple standardized ones, lots of them, and very quickly: 11 million documents a year, and the amount is steadily increasing. This experience report describes the unique challenges that we faced when we introduced the system in 2008, how we approached them from both a technical perspective and the business processes needed to put such a system into place. In particular, in the technical section it details why \DVI\ output of \TeX\ processors should not be abandoned\Dash it is not a thing of the past if you go beyond book publishing. On a side track, technical provisions to support audit trails demanded by bank regulations are outlined. This might be of interest for other industry sections where audit demands about document creation are stringent. Overall, the talk shows the incredible flexibility of \TeX, and the pecularities of using the \TeX\ ecosystem in a commercial environment that doesn't belong to the publishing industry or to academia.}