Thanks for your input. I added the following lines to "tust.h":
Code:
/**
* A global skill to save an entity type
*/
#define TUST_TYPE skill[99]
/**
* A global skill to save an entity sub type
*/
#define TUST_SUB_TYPE skill[98]
/**
* A global skill to save a data pointer
*/
#define TUST_DATA skill[97]
