在看Cognos Architecture Deployment.pdf 的时候，讲到网关时，有以下一段论述，有点不明白，请专家指点:
Cognos 8 supports several types of Web gateways, including
● CGI
The default gateway, CGI can be used for all supported Web servers. However, for enhanced
performance or throughput, you may choose one of the other supported gateway types.
● ISAPI
ISAPI can be used for the Microsoft Internet Information Services (IIS) Web server. It delivers
faster performance for IIS.
● apache_mod
You can use an apache_mod gateway with the Apache Web server.
● servlet
If your Web server infrastructure supports servlets or you are using an application server, you
can use a servlet gateway.
这是什么意思? Cognos的网关可执行程序不就是cognos.cgi嘛?为什么还有 ISAPI、apache_mod、servlet呢?
ISAPI是在用IIS作为Web Server的时候，好像可以启用ISAPI的选项？
apache_mod 可以用apache作为Web Server，但最终网关可执行程序也是cognos.cgi?
servlet 这个是什么意思?
附件：
Cognos Architecture Deployment.pdf (1.1 MB)
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