There is Doxygen content for CLP available online at http://www.coin-or.org/Doxygen/Clp/index.html. A local version of the Doxygen content can be generated from the CLP distribution. To do so, in the directory COIN/Clp, enter make doc. The Doxygen content will be created in the directory COIN/Clp/Doc/html. The same can be done for the COIN core, from the COIN/Coin directory.