Whats the difference between the CGI and the ISAPI interfaces?
Starting from version 2.0, Abyss Web Server supports dynamic documents generation through ISAPI extensions (besides the classical CGI applications interface.) ISAPI extensions are loaded on-demand and become resident in the server process space. This enhances significantly the performance as an extension is only loaded once and does not require any communication overhead with the server. At the contrary, CGI applications are loaded every time they are needed, are executed in another process, and communicate with the server using interprocess communication mechanisms to input and output data. CGI applications and interpreters are usually easier to setup and more widely available. Because ISAPI extensions are loaded in the server process space, they can crash the whole server if they cause a critical error. This is not a problem with Abyss Web Server since it features the anticrash system so it is automatically restarted if such a situation happens. But as a general rule, avoid using ISA
