Pascal application programming interface

This information describes the Pascal language for IPv4 socket application program interface (API) that is provided with TCP/IP. This interface allows programmers to write application programs that use the TCP, UDP, and IP layers of the TCP/IP protocol suite. Topics include:

Software requirements
Data structures
Using procedure calls
Pascal return codes
Procedure calls
Sample Pascal program

To use the Pascal language API, you should have experience in Pascal language programming and be familiar with the principles of internetwork communication.

Your program uses procedure calls to initiate communication with the TCP/IP address space. Most of these procedure calls return with a code that indicates success or the type of failure incurred by the call. The TCP/IP address space starts asynchronous communication by sending you notification.

Note: The Pascal API is not enhanced for IPv6 support.