Speedbar can run different types of Major display modes such as Files (see File Mode), and Buffers (see Buffer Mode). It can also manage different minor display modes for use with buffers handling specialized data.
These major and minor display modes are handled through an extension
system which permits specialized keymaps and menu extensions, in
addition to a unique rendering function. You can also specify a wide
range of tagging functions. The default uses imenu, but new
tagging methods can be easily added. In this chapter, you will
learn how to write your own major or minor display modes, and how to
create specialized tagging functions.