R3SendMsg
void *R3SendMsg(R3OBJ *obj, int mth, ...);
obj - object to whom the message is to be sent
Method specific return value
Asks the object 'obj' to perform method 'mth'. Parameters for the method are passed in p1, p2 and tags (depends on the method in question).
R3SendMsg(obj, R3RM_WRITE, R3RA_FileObject, file, R3TAG_END);