struct prefix {
/*
 * This structure defines buffer prefix
 */
struct prefix *next; /* Pointer to next buffer */
struct prefix *prev; /* Pointer to preveius buffer */
unsigned char type;  /* Type of operation (i.e. Send,Flush,Confirm)*/
unsigned char dsc;   /* Segment descriptor */
unsigned int  lt_text; /* Length of text */
char *text; /* Pointer to text filling the buffer*/
};