struct com {
/*
 * This structure contains common fields for all
 * conversation verbs.
 */
char rsrv1[12];     /* Required for PORT */
unsigned int code;  /* Verb operation code */
unsigned char e_cd; /* Verb extension code */
unsigned char rsrv2[5];
unsigned int prim_rc; /* Primary ret code */
unsigned long sec_rc; /* Secondary ret. code */
char tp_id[8];
unsigned long conv_id;
};