When writing DB2 CLI applications, you may need to reference information for the database servers that are being accessed, in order to understand any connectivity issues, environment issues, SQL language support issues, and other server-specific information. For DB2 Universal Database versions, refer to SQL Reference, the Application Development Guide, and the Administrative API Reference. If you are writing applications that will access other DB2 server products, refer to the SQL Reference which contains information that is common to all products, including any differences.