With few exceptions, the data structures used internally by SYMPHONY are undocumented and most users will not need to access them directly. However, if such access is desired, a pointer to the main data structure used by each of the modules can be obtained simply by calling the function get_*_ptr() where * is the appropriate module (see the header files). This function will return a pointer to the data structure for the appropriate module. Casual users are advised against modifying SYMPHONY's internal data structures directly.