Each time the players get together to make progress in the story, it is called a session. The session may or may not be at the Narrator’s home. Regardless of location, the Narrator is considered to be hosting or facilitating the session.
There are two modes to a session: “in play” or “out of play”. While “in play”, the players and narrator should be mostly focused on the game, the story, and the imaginary world. When “out of play”, everyone is back in reality. Groups will have different ideas and rules regarding when and how strict of a difference “in play” is to “out of play” but generally speaking, when the session is “out of play” the players and narrator are free to speak without affecting game play or the story. And even while “in play” everyone should be cognizant of the real world, their personal safety, and any reasonable obligations.