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“Please do so,” said Stacy J. Berman, the Georgetown branch manager broker for Long & Foster. “It’s really rude not to provide your name. The reason we ask for names and phone numbers is a security precaution. It enables Realtors to track attendees in case there are emergencies or crimes occur.”

The agent represents the seller and the seller wants to know who has been in their home.

“That is a legitimate request,” she said. “It’s OK to jot down ‘do not contact me’ beside your name, but don’t deliberately inscribe a false phone number or email address.”

Agents are professionals and they respect privacy boundaries.

“We are aware visitors are hesitant to share their personal data, but be comforted to know that you will not be trapped or stalked by the agent hosting the open house,” Ms. Berman said.

“We also recommend that you follow any requests an agent may make,” she added. “For example, if I ask someone to take off your shoes, I’d really be grateful if they did so without getting huffy. This is not your house, it is not a public space and you are a visitor. And we as Realtors are respecting the requests of the property owner.”

Perhaps the owners just installed a white carpet or it could be raining and messy outside.

“Realtors work for the seller and we are simply their messenger,” Ms. Berman said.

Coming in with a coffee or soda in your hand is also not a good idea. If coffee and cookies are laid out, confine your eating to the spot in which they are offered.

“Do not bring along a dog too big to hold in your arms,” advised Ms. Greene. “And smoking is absolutely forbidden.”

Loudly conversing with your viewing partner about how to lower the price is bad manners. While it is natural as a buyer to be hard-hearted about cost and to wonder how much the house will be worth in a few years, it is best to keep your thoughts private.

“Bringing an entourage of relatives and friends for a first viewing is rather disruptive,” Ms. Lasansky said. “Chattering loudly in a foreign language is rude because the Realtor doesn’t understand and cannot answer your concerns.”

Overall, be charitable, good-humored and forgiving.

“There’s always something in a home - the layout, the flowers - that deserves a compliment,” said Claudine Chetrit, with Coldwell Banker in the District.

Keep in mind, one day you will be a seller, too.