In graphical user interfaces, a dialog (or dialogue) box is a special window, used in user interfaces to display information to the user, or to get a response if needed. They are so-called because they form a dialog between the computer and the user — either informing the user of something, or requesting input from the user, or both. It provides controls that allow you to specify how to carry out an action.[...] (
Wikipedia - Dialog box)
The image below shows an example for a dialog in Virtual Spaces.