19.4.3 Accessing a VAX Rdb/VMS Database
  If you have purchased a VAX Rdb/VMS development li-
  cense, you can store and access data in a VAX Rdb/VMS
  database from a BASIC program. To do this, you embed RDO
  statements in your BASIC program. Each line of an RDO
  statement must be preceded by the Rdb/VMS statement flag
  (&RDB&). BASIC line numbers cannot be included in any
  RDO statement line. You then precompile your program
  with the Rdb/VMS precompiler. The precompiler translates
  the RDO statements into BASIC statements that make direct
  calls to Rdb/VMS.