My T has only ever made very vague comments about other clients or people in her life - nothing identifying - and only anecdotal or to make a point or make me feel better about my situation or whatever, just like "I know other people who would sit in that chair and say they wished they were less [this thing you want to be] and more [this thing you are]..." or something like that. Never any more specific than that. And appointments seem to be sufficiently spaced to allow for no overlap. One time the window cleaners came around and so she shut the blinds and kept my session going until they left! I think my T takes her clients confidentiality very seriously. More seriously than I'd even expect, to be honest, but it makes me feel safe. If she told me specifics about other people I'd worry things I told her would go further, too. I could make a pretty safe bet that my T is discreet in her private life, too. Some people are more inclined to gossip than others, I guess, so some Ts will probably let a little more slip than others, like 'I probably shouldn't say this, but...' - I wouldn't like that.