void RegSystem()
{
char serial_no[20];
char hdstr[20],hdno[9];
char InStrReg[20];
char RegNum[20],str[20],str1[20],str2[20];
union REGS r;
struct SREGS s;
unsigned sno1, sno2;
FILE *fp;
int  i;
struct date today,today1;
struct ffblk fblk;

       
        getdate( &today1 );

        r.x.ax = 0x6900;
        r.h.bl = 3; /* A:=1, B:=2, C:=3 etc. */
        segread(&s);
        intdosx(&r, &r, &s);
        if (r.x.cflag)
            strcpy(serial_no , "");
        else
        {
            sno2 = *((unsigned far *)MK_FP(s.ds, r.x.dx+2));
            sno1 = *((unsigned far *)MK_FP(s.ds, r.x.dx+4));
            getdate( &today );
            today.da_year++;
            today.da_mon+=10;
            if ( today.da_mon > 12 )
            {
                today.da_mon -= 12;
                today.da_year++;
            }
            sprintf( serial_no, "%04X%04X%04d%02d%02d0", sno1, sno2,today.da_year,today.da_mon,today.da_day );
            for(i=0;i<17;i++)
            {
                   serial_no[i]+=i;
            }
            serial_no[i]='\0';
            sprintf( hdstr, "CAI%04XXU%04XCHU", sno1, sno2 );
            sprintf( hdno, "%04X%04X", sno1, sno2 );
            for( i=0;i<16;i++ )
                hdstr[i] += i+today1.da_mon+today1.da_day;
            hdstr[i]='\0';
        }
//        printf("The Serial Number of Login Disk [C] is %s", serial_no );
        if (findfirst("cccxxx.dat",&fblk,0))
        {
           fp = fopen( "aaa.dat","r" );
           fgets( RegNum,2,fp );
           fclose( fp );
           RegNum[1]='\0';
           i = atoi( RegNum );
           i++;
           if ( i > 5 )
           {
              printf("\n Last Regis error!! Please Tel Or Fax." );
              exit( 0 );
           }
           itoa( i, RegNum,10 );
           fp = fopen( "aaa.dat","w" );
           fputs( RegNum, fp );
           fclose( fp );
           printf("\nRegistNum %s", hdstr );
           printf("\nPlease Input new RegistNum:" );
           gets( InStrReg );
           if ( strcmp( InStrReg, serial_no ))
           {
                printf( "\nRegister error!" );
                exit(0);
           }
           else
           {
                fp = fopen( "cccxxx.dat","w" );
                fputs( serial_no,fp );
                fclose( fp );
           }
        }
        else
        {
           fp = fopen("cccxxx.dat","r");
           if ( fp == NULL )
              exit( 0 );
           fgets(str,18,fp);
           fclose(fp);
           str[17]='\0';
           for(i=0;i<17;i++)
           {
                 str[i] -= i;
           }
           for(i=0;i<8;i++)
              str1[i]=str[i];
           str1[8]='\0';
           if ( strcmp( str1, hdno ) )
           {
              printf("\nserial_no1 error!" );
              exit( 0 );
           }
           if ( str[16] != '0' )
              exit( 0 );
           else
           {
              for( i=8;i<16;i++ )
              {
                 str1[i-8] = str[i];
              }
              str1[i-8]='\0';
              getdate( &today );
              sprintf( str2,"%04d%02d%02d",today.da_year,today.da_mon,today.da_day );
              if ( atol(str2) > atol(str1) )
              {
                str[16]='1';
                for (i=0;i<17;i++)
                {
                    str1[i]=str[i]+i;
                }
                str1[i]='\0';
                fp=fopen( "cccxxx.dat","w");
                if (fp==NULL)
                {
                   exit(0);
                }
                fputs(str1,fp);
                fclose(fp);
                exit( 0 );

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