Okay, responding point by point:

A) I need to accomplish this interaction for a current project

The two modules are available today. I show many examples of their usage in my WT columns, as do many other tutorials.

B) I want to understand the details so I can be the one writing the modules one day

Good, then you'll want to study good code that does useful things. The source to these modules is well documented and less buggy than almost anything else you'll see on the net. So use the modules, then trace down inside to see what they're doing.

Do not attempt to build new technology without understanding existing technology. Reinventing the wheel is fine as long as you don't do it ignorantly.

-- Randal L. Schwartz, Perl hacker