In this recipe, we will learn how to create an application that will display more than one document at a time. Not only will we be able to manage more than one document, but we will also learn to arrange the documents in different formats. We will be able to manage more than one document using a concept called Multiple Document Interface, so let's see a quick introduction to this.
Usually, an application provides one document per main window and such applications are said to be Single Document Interface (SDI) applications. As the name suggests, a Multiple Document Interface (MDI) application is able to display several documents. An MDI application consists of a main window along with a menu bar, a toolbar, and a central space. Several documents can be displayed in the central space, where each document can be managed through individual child window widgets; in MDI, several documents can be displayed and each document is displayed in its own window...