Ключевые слова: age, analyst, background, banner, business, businessman, call, caucasian, chart, chat, computer, conference, conferencing, copy, course, dashboard, desktop, elearning, entrepreneurship, executive, financial, graph, male, man, marketing, mature, meet, meeting, men, monitor, multiple, office, older, online, panoramic, pc, plan, planning, presentation, screen, service, space, training, using, video, videoconference, virtual, webcast, webinar,