Writing dynamic pages with fastcgi

[drhowarddrfine]

I think this is a server config question. I'm using lighttpd but this
probably applies to Apache and others as well. There must be something
I just don't understand about writing dynamic pages. Here is the
problem:

All my pages are created dynamically. I'm using C but it shouldn't
make any difference. I wrote two apps, one for the index page and
another for a "page2". I can access my index page at www.mypage.com.
That works. But when I try to access www.mypage.com/page2, the server
sends the request to the original index app for processing.

Why doesn't it go to the page2 app instead?

I wouldn't think I'd have to config the server for each and every page.
Or is this a fastcgi problem? Can someone straighten me out cause I'm
sure I'm just forgetting all about something simple.