(Internet slang) opening 2 different windows (chatroom, etc.) at the same time

two, 2 / second

room (of a house or hotel), chamber, apartment, flat / (sumo) a stable where rikishi live and train together under a shisho oyakata (stable master)

double room

(Internet slang, dated) Windows (an operating system)

double-pane window, found especially in Hokkaido and Tōhoku as cold-proofing

window / (regional, dialect, Etchū region) a deep gap in a mountain ridge (so called for the way the wind blows through, like a window)

window

an adult son residing with his parents; generally has not yet or can not come into family inheritance / a female servant working in a daimyō, ōoku, or other high-ranking house

room rent