Ключевые слова: 404, accident, alarm, available, bankruptcy, beware, broken, careful, caution, computing, cyberspace, danger, dangerous, depression, disconnect, error, exclamation, fail, hazard, illustration, information, maintenance, mistake, network, notice, oops, page, problem, process, program, repair, risk, safety, security, service, signs, stop, support, symbol, system, technical, technology, trouble, update, upgrade, warn, web, web page, website,