PHP installed as CGI not as apache module ?

[runeveryday]

i don't know what is PHP installed as CGI ,and what is PHP installed as apache module .what's the difference between them, the more detail, the better.thanks in advance.

[Myth_UK_]

Speed and options if I recall.

I am on a windows server, using fast cgi, but if you use apache, then use the module (for more speed, more option, etc).

[runeveryday]

is there a simple way to make the decision that my PHP is installed as apache module or CGI, if i use the integrated environment,eg:XAMP. which style is PHP installed ?thank you