This information describes the CALL instruction API for IPv4 or IPv6 socket applications. The following topics are included:

• CALL instruction API environmental restrictions and programming requirements
• CALL instruction API output register information
• CALL instruction API compatibility considerations
• CALL instruction application programming interface (API)
• Understanding COBOL, Assembler, and PL/I call formats
• Converting parameter descriptions
• Diagnosing problems in applications using the CALL instruction API
• CALL instruction API error messages and return codes
• Code CALL instructions
• Using data translation programs for socket call interface
• Call interface sample programs