Advanced display systems include digital placards (projectors) and multi-point optical projection (Image Flow) technology. There are various environments in which multimedia can provide dynamic content to targeted audiences. Though mainly used for large public events such as outdoor broadcast tower installations or conference hall masked video walls, you might use it anywhere people gather: subways and busses; shopping malls or selling houses. Put it on display at wedding parties if you will. These solutions should include featuring advertisements, wayfinding advice, real-time information, and customer answering services. Typical technical elements might include any number of high-resolution screens, content management software, and connectivity options for remote updates. Such solutions are used in retail stores, restaurants, corporate offices, hospitals and other medical facilities, as well as educational institutions. The adaptability of digital signage is to be found in its rapid update and easy customization. This is a key tool for communication and marketing.