it's possible to enable a mode called "horizontal span" which accomplishes this. The OpenGL/DirectX programmer then renders to a very large frame buffer for output. In practice, and with recent cards, this mode is being phased out because it does not make very good use of GPU parallelism and does not support arbitrary arrangements of monitors (they must all be horizontal). A more recent technique uses the wglShareLists feature of OpenGL to share data across multiple GPUs, and then render to each individual monitor's frame buffer. In Android Android supports an additional monitor as of version 4.2 but additional software is needed to multi-task/use both at once. Second displays A second display or second displays is a common term describing the multi-monitor setup with just one additional monitor attached. Today it is particularly common to have one workstation with two monitors connected where the second monitor is referred to as the second display. Many tablets will serve as a second display connected to a laptop. Many modern shops use cash registers with two screens, one facing the cashier and a second display facing the shopper. Today's second display has evolved from a multi screen personal computer monitor to having multiple technical features such as a touchscreen, web cam or even a barcode reader in stores. When a simultaneous touch input is performed on two devices simultaneously there will be a technical solution required to solve the dual input. In 2017 LG unsuccessfully tried to copyright the term “second display”, meaning that it is available for everyone to use freely. Professional meaning Shop and IT-support staff can use the term “second display” when referring to the second monitor in a multi-monitor setup. Retail and hotel businesses have a professional meaning for a "second display", also known as interactive customer display or dual-screen for shops. The term is used in retail and hotel environments when referring to a customer facing display that is connected to the point of sale (POS) system. Normally a second display solution contains both hardware and interactive software allowing the shopper to perform certain actions. The second display is most commonly used to show the total purchase amount and the purchase list. Some advanced systems contain functionality relating to loyalty and member data. In an article from 2021 the Swedish retail magazine Dagens Handel mentions the provider of second displays ID24 and their published survey among retail and