Production can be further streamlined by using master pages, which may contain text, picture boxes, and guides. Each new page inherits items from a chosen master page, including 9optionally0 a page number that changes automatically. The designer can create any number of master pages, allowing several alternative layouts to be used within a document, and InDesign users can also base one master page on another, with any changes to the ‘parent’ propagating to the ‘child’. Page can be set up singly or facing each other in spreads, and special layout such as gatefolds can be accommodated. Master pages, style sheets, colours, and H&J settings can be appended from one document to another; QuarkXPress users can work within a ‘project’ that may comprise several different layouts sharing master pages, style sheets, colours, and so on.