$Id$ This directory contains a sample of "special" files that deal with specialized applications. It allows the user to do completely new things with the code that have nothing to do with hydro or MHD, for example. The best way to start a new special module is to go to pencil-code/src/ and copy nospecial.f90 to special/NewSpecialModule.f90 and start editing NewSpecialModule.f90 for your purposes. This approach is better than modifying an existing special module, because the tend to be too specialized! The nospecial.f90 module also contains lots of comments. Example: cp nospecial.f90 special/oscillation_0D.f90 However, looking for example also at special/lorenz_gauge.f90 might indeed be a good idea.