Several network programming methods for Instant Messaging Software Development

Several network programming methods for Instant Messaging Software Development:

ISAPI, CGI, wininet, Winsock

Differences between them:

1) ISAPI is mainly used to develop browser-based clients and server-side programs. It is more efficient than CGI, and also extends some features that CGI does not have. (Based on the application layer in the TCP/IP Model)

2) CGI is mainly used to develop browser-based clients and server-side programs. (Based on the application layer in the TCP/IP Model)

3) wininet is mainly used to develop client programs. (Based on the application layer in the TCP/IP Model)

4) Winsock is mainly used to develop client and server programs based on socket. (Based on the layers in the TCP/IP model) to develop programs with lower-layer protocols, you must understand the protocol message format.

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