void cd_Main"(UBYTE *argstr);
   
   ---
   
   Purpose: this is the main entry point for the door, 'argstr' contains
            the node.
            
   Results: OK                  - door ended normally
            ERROR_MESSAGE       - error allocating message structure
            ERROR_CONTROLPORT   - error acquiring MAX's port
            ERROR_REPLYPORT     - error creating doors reply port
            ERROR_ABORTED       - door ended due to cd_End()
            ERROR_CARRIER       - transmission ended