I just had a slightly annoying experience, which has me wondering whether SkyTeam partners can see each other's FF preferences.

I'm flying business class on a KLM-operated NW codeshare, IAD-AMS-NBO and DAR-AMS-IAD on the return. When I first made my reservations, my agent confirmed window seats, and added my DL number. My DL profile notes a window seat preference.

When the tickets were issued, however, my itinerary showed aisle seating. Sure enough, my agent told me that NW "must have dropped your seating assignment" and given me aisles instead. NW claims it did no such thing, and that they have no record of my original seating assignment. No big problem; agent was able to get me window seats back on all legs but one.

Does anyone know whether or not NW can see my SkyMiles seating preference?

From a simple logistics of it, I would be suprised if partner airlines "saw" seating (or any other) preferences. Access accross (proprietary / closed) systems, standards, data formats etc etc. So, my guess is that answer is no.
Now, what I would imagine they would do is forward the seating preferences at the time of booking (similar to what Expedia would do for example) and if everything goes ok, you get the seat you want. If not - oh, well...

In short, I've been told no.