[plt-scheme] newbie: web server tutorial questions

just before the https section in the tutorial: http://docs.plt-scheme.org/continue/index.html

   I tried> mzscheme -t blog.ss

   and got back> blog.ss:150:33: compile: unbound identifier in module
in: path

sooooooo, is <file.ss> supposed to be the same value as
"APPLICATION.ss", and are both of these supposed to be the place the
application code was getting cut and past (in my case "blog.ss")?  Are
all the ss files supposed to reside in a servlets folder?  and is

        #:servlet-path "/servlets/APPLICATION.ss"

a relative path to htdocs?

and in the following,
       (list (build-path path "htdocs"))

is htdocs relative to where you run the mzscheme command?

Thanks.