I am a full member of NZAC, and abide by their Code of Ethics.
All counselling sessions, our communications and the fact you are attending counselling are completely confidential, unless you give your consent to any particular information being disclosed.
The first exception is supervision, which I attend under my professional code of practice. However, discussing counselling processes and issues does not mean disclosing your identity, and my supervisor is also bound by a Code of Ethics including confidentiality.
The second exception to this principle is when, in my professional judgement, I believe there is clear and imminent danger to you or others. This would include circumstances where your competence to make a decision is impaired and is something, where possible, I would discuss with you first.
At a practical level, this also means if I see you out and about or in another context that I would not acknowledge or approach you, so you do not have to explain me to whoever you are with. You, of course, can approach me if you wish.