When discussing how a Web server works, it is not enough to simply outline a diagram of how low-level network packets go in and out of a Web server.

ISAPI Perl is a version of Perl for ISAPI-compliant Microsoft Windows-based Web servers. Essentially, ISAPI Perl builds on CGI/Perl. In the early days of Web servers, Common Gateway Interface (CGI) allowed Perl programs to interact with a user's browser through the Web server.