That's a Siemens dishwasher (same as Bosch really)
That dishwasher above is a Siemens. Siemens and Bosch have a joint venture company that makes domestic appliances under both companies brand names : BSH - Bosch & Siemens Hausgeräte GmbH.
The models are generally very similar / identical although the Siemens washing machines on sale in Ireland anyway seem to be aimed at a higher price point than Bosch and tend to be top of the line only. (That may not be the case in Germany)
I've a Bosch dishwasher, but have had others over the years too e.g. Zanussi and I've never had to pre-rinse anything. Any European dishwashers that I'm familiar with have fairly similar filtration systems. Basically you have a large filter unit in the bottom of the machine which contains a a series of progressively finer filters. When the machine's washing it sucks water through from the side of the filter system which forces it through all of the filter layers (including fine mesh). When the machine's draining the water flows straight down through the centre of the filter, only filtered by a coarse grid. The drain pump's designed to pass any normal sized food particles through without clogging and the coarse filter will catch anything too big for the pump.
The result is that the drain pump basically cleans the finer elements while it's emptying the machine as well as getting rid of the majority of food particles directly down the drain.
Most machines here run a cycle in the following steps:
It goes something like this:
1) Short prewash (cold, no detergent) to remove loose food particles. (These are mostly flushed down the drain) (If you select an intensive option, it will heat the prewash water in some machines e.g. Bosch)
2) Main wash (typically 65C (normal) or 75C (intensive) ) (149F or 167F) [Eco washes may be cooler e.g. 55C) (on draining, any further gunk in the filter is usually cleared out)
3) Cold rinse (quite short)
4) Cold rinse (quite short)
5) Hot rinse (65 or 75C). (With rinse aid to prevent streaking)
6) Pause while the residual heat of the dishes dries them.
At the end of the wash you may find very large chunks of food are still present in the filter, but in general it will be pretty clean. It's still advisable to clear it out once in a while though.
European machines (although I'm not sure about European machines built for the US market) also have lime scale filters built in as standard. The water intake goes through an ion exchange filter which softens the water, removing calcium and magnesium ions as the machine fills.
The filter's reset and regenerated by flushing it with a concentrated salt sollution once in a while. The machine does this automatically, you just need to keep it supplied with dishwasher salt (large crystals of non-iodised salt) which you fill into resevoir in the machine typically once every few months (depends on your water hardness). Most machines will let you know when they need more salt, by displaying a message or an indicator light comes on.
It improves results drastically though as *ALL* water is softened in the machine. i.e. all the rinses, including the final hot rinse use softened water.
This is a major advantage over just relying on the detergent to soften the water, as it's only softened during the wash cycle.
Hence, the 3-in-one with "Salt Function" products on the market here are never as good for your machine or your dishes as using the machine's internal filters and you can expect your dishwasher's heater to become caked in limescale, particularly if you're in a hardwater area as it will deposit during the hot rinse cycle.
I'm not 100% sure, but I suspect there may be slight differences in the formulations of US and European dishwasher detergents too. I suspect we might, like clothes detergents, use a lot more enzyme-based cleaning and less bleach. Older dishwasher detergents here used to be pretty heavily chlorine bleached based. The modern ones are far more effective and don't fade patterns / colours.