For me it was at a big house in a wealthy suburb, and we talked one on one in the living room. There was no real guidance or explanation other than here is the time and place.

From what I could remember, the alumni interviewer was kind, I just couldn't articulate answers to his questions as I was unprepared and didn't know what to expect. With some insight on the process, I probably could have done better, but it doesn't really matter.

I ended up on a different path and am content with where it lead.

My larger point is that there are many little ways where legacy advantages can leak through even if you have an explicit policy of not considering it.

I think alumni interviews are such a possible mechanism of still factoring in legacy status or making this advantages stand out without it being on the application.