Mandatory

When you derive from a KcsIO class, the mandatory external entry points are:

extern long KcsDLOpenIOCount; 
KcsIO *KcsCreateIO(KcsStatus *aStat,
      const KcsProfileDesc *aDesc);

The KcsCreateIO() method creates an instance of a KcsIO derivative. The instance is determined by aDesc->type, which contains the derivative portion of the class identifier (see "Creating OWconfig File Entries").