Invariably, certain topics relate to other topics. For the information in your title to be clear and understandable, you might need to display certain groups of topics in a specific sequence. Viewer lets you group specific topics and structure them in units called browse sequences. A browse sequence is simply a series of topics that appear in a sequence when the user chooses the << and >> buttons —like turning pages in a book.
When you design your title, you must decide which topics to group together into browse sequences. You might decide to place the topics within a browse sequence in separate files, with the first topic in the sequence at the beginning of the file, and the last topic in the sequence at the end of the file. In the USA Tour sample title, each state within an RTF file uses its own browse sequence.
Once these sequences become part of a title, the << and >> buttons below the Viewer menu bar let users move back and forth between related topics. The browse buttons become active whenever Viewer displays topics coded with a browse sequence. At the beginning of the sequence, only the >> button is active. At the end of the sequence, only the << button is active. In the middle of the sequence, both buttons are active.