# Documentation

Documention unfortunately belongs to the most-overlooked programming issues. Yet, once properly set up and maintained internal and external documentation provides most valuable help.

Documentation has multiple facets. There is

- project internal documentation, mainly consisting of

  - comments in header/source files

  - internal &API; documentation of your project generated from the program file by special tools, ⪚ &doxygen;

- project external documentation, comprising among others

  - external &API; documentation of ⪚ common system libraries (&kde;, &Qt;, &etc;)

  - any other documentation (programming language manuals, general system information, how-to articles and the like)

All this documentation should be easily maintainable and ready at hand whenever you need it. &tdevelop; has provisions for just this.

## The Documentation Browser

### A Screenshot of the Documentation Tree