Why don't you compare the two product editions on the Adobe website and see which one fits your needs;
Indesign[
^]
Indesign Server[
^]
Or hop over to the
Indesign SDK[
^] pages for more on the API and tools.
(You also asked this question at the foot of the article, which was the correct place to ask it. The Author may no longer be active on the site and hence no answer for a month).