Info pages, which are another component of the built-in help system, are available for many software products from the GNU Project.^[19] To get started, try typing info or info info or info some_program (such as info gcc) at the prompt. The navigation commands are different from those for the man pages: ? provides a list of commands and h starts a tutorial (but q still quits). It is worth checking the info pages for information on specific GNU programs.^[20] You can also find the built-in documentation for the GNU C library (or glibc) by typing info libc at the prompt.^[21]