DataDirect Connect for ODBC User's Guide and Reference

DSN=data_source_name[;attribute=value[;attribute=value]...]
FILEDSN=filename.dsn[;attribute=value[;attribute=value]...]
DRIVER=[{]driver_name[}][;attribute=value[;attribute=value]
...]
DSN=NSK TABLES;NTIL=4
FILEDSN=NSK.dsn;NTIL=4