In article s.com, "EXT" wrote:
Another Usenet myth. I have a Bosch dishwasher and it does not vent the
moisture down the drain. How could it? The trap would stop all but fairly
strong air pressure. Also, most dishwashers are tied into the drainline
along with either the sink or garbage disposal ahead of the trap, and the
moisture would just come up through that route.

Some (not all) Bosch models have what they call
"Condensation Drying".

I don't know how well it works in reality but it is
most certainly a feature that Bosch advertise and
their description of it seems reasonably sensible:

http://www.boschappliances.com/highlight.
cfm?product_id=375&htype=2#highlight_25

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