New terminology often comes with new programs, so it's completely understandable if you get confused.
Here's a quick explanation of a pulse and Pulse Fast:
A Pulse Fast is a 36-hour fast where you basically drink MAG-10 and Power Drive for a full waking day plus two nights: Go to bed, wake up and consume nothing but the Pulse Fast components, go to sleep that night, wake up the next day and eat normally. That has been referred to as a "Pulse."
But we've also called every serving of the Pulse Fast drink a "pulse" as in "pulse when you wake up, then 2 or 3 hours later have another pulse..." etc.
So, when you hear someone say he is going to do a "pulse" on Monday, he could either be saying that he'll be having one serving of it (maybe between meals), or he could be saying that he'll be doing the program for the 36-hour period (Pulse Fasting).
All that said, a long-range Pulse Fast might be every Monday for an extended period of time, or every Monday/Thursday for a month etc.
So the language can be a bit confusing, but the full program is outlined here: http://www.t-nation.com/free_online_article/sports_body_training_performance_bodybuilding_supplements/mag10_pulse_fast
Hope that clears it up a bit!