Running doxygen config-file creates html, rtf, latex, xml, and / or man directories in whichever directory doxygen is started in, containing the documentation for the corresponding filetype.
This documentation can be viewed with a HTML browser that supports cascading style sheets (CSS), as well as DHTML and Javascript for some sections. Point the browser (for example, Mozilla, Safari, Konqueror, or Internet Explorer 6) to the index.html in the html directory.
Doxygen writes a Makefile into the latex directory in order to make it easy to first compile the Latex documentation. To do this, use a recent teTeX distribution. What is contained in this directory depends on whether the USE_PDFLATEX is set to no. Where this is true, typing make while in the latex directory generates refman.dvi. This can then be viewed with xdvi or converted to refman.ps by typing make ps. Note that this requires dvips.
There are a number of commands that may be useful. The command make ps_2on1 prints two pages on one physical page. It is also possible to convert to a PDF if a ghostscript interpreter is installed by using the command make pdf. Another valid command is make pdf_2on1. When doing this set PDF_HYPERLINKS and USE_PDFLATEX tags to yes as this will cause Makefile will only contain a target to build refman.pdf directly.
This file is designed to import into Microsoft Word by combining the RTF output into a single file: refman.rtf. Some information is encoded using fields but this can be shown by selecting all (CTRL+A or Edit -> select all) and then right-click and select the toggle fields option from the drop down menu.
The output into the xml directory consists of a number of files, each compound gathered by doxygen, as well as an index.xml. An XSLT script, combine.xslt, is also created that is used to combine all the XML files into a single file. Along with this, two XML schema files are created, index.xsd for the index file, and compound.xsd for the compound files, which describe the possible elements, their attributes, and how they are structured.
The documentation from the man directory can be viewed with the man program after ensuring the manpath has the correct man directory in the man path. Be aware that due to limitations with the man page format, information such as diagrams, cross-references and formulas will be lost.