[PD] is pdp supposed to work?

[Matteo Sisti Sette]

 >> By the way, apart from help patches documenting each object
 >> and example patches, is there some getting started guide
 >> or complete manual explaining what pdp is in the
 >> first place?
> Sure, in the page of project:
>
> http://ydegoyon.free.fr/pidip.html
>

Hi,

Thank you, but that seems to me more of a reference (or even a mere 
list) of individual objects.
I'm looking for an introduction or getting started guide,

I mean, where I can find answers to questions like: what is a packet? 
What kind of data do pdp objects handle? What is the bare minimum you 
need to work with pdp (like [gemwin] and [gemhead] in gem)?

Is there such a guide or reference manual? If not, I guess I can learn 
it by looking at help patches but what objects should I start from?

thanks
m.