This book discusses Net.Data's language environments, which are used when you call programs or functions, or data sources like DB2, Oracle, or Sybase databases. People writing Net.Data macros can use this information to find the capabilities of the language environments that Net.Data provides. This book also contains information for people who want to write their own language environments as backends to Net.Data. To understand the concepts discussed in this book, you should be familiar with the C programming language and the information in Net.Data Programming Guide and Net.Data Reference Guide.