Ключевые слова: audience, audiovisual, background, business, businessman, classroom, computer, conference, congress, convention, corporate, digital, education, equipment, event, forum, group, hall, indoors, interior, lecture, lens, light, listeners, manager, meeting, modern, movie, multimedia, office, participants, people, presentation, professional, projection, projector, public, room, screen, seminar, slide, teaching, technology, training, video, workshop,