Sorry - your question regarding dual agency. Basically it means that I have a listing that is on the market and you have decided to buy that listing. When in a dual agency situation (which does not come up that often) the realtor involved has specific responsibilities in the transaction. She is a transaction broker at this point - she/he can do all the paperwork, recommend home inspectors, etc., do a market analysis but can not tell you what to offer or tell the seller what to accept.
They will also need you to sign a Dual Agency Confirmation and Disclosure document which spells out the exact duties. Confidentialty is one of the duties - she/he can't discuss your personal situation with the seller nor can she/he discuss the seller's personal information with you unless expressed permission is given by the parties involved. I can send you a copy if you want to review it.
I have done several transactions in my real estate career being a dual agent but its not the norm by any means. In FL they use transaction brokers which basically means that the agent does the paperwork for the transaction, recommends ancillary services (home inspection, mortgage, etc) but does not have the fiduciary duties that we have in IL.