CDMA vs GPRS: umm... what's an ESN?

I started reading a lot of classic literature a while ago. Don't get my wrong, I enjoy Harry Potter and absolutely loved His Dark Materials. But there are way too many pieces of classic literature out there that I know I could learn a few things from. Anyway, I read a few Mark Twain books, and something he said has something to do with CDMA networks:

"It ain’t so much the things we don’t know that get us into trouble. It’s the
things we know that just ain’t so."

I read over here that "CellID" (a GPRS term) is the same thing as ESN on a CDMA. Which sounds true, except that my phone seems to have the same ESN here in Sky Harbor International Airport as it does when I was in downtown San Diego. I have to be a little quiet on this project right now, but I would take someone out for dinner and dancing if they could explain to me:

• What is the comparative value of CellID on a CDMA network?
• What is the comparative value of MNC and MMC on a CDMA network?

In CDMA land, there's a SID and NID value, but what the heck are those? And if my ESN is static (which is sure seems to be, unless I'm still connected to a San Diego cell tower 400 miles away), then what's the difference between a PIN and an ESN? Two static numbers (three, if you count the phone number itself).

I don't get it, but I will. Oh, and if you tell me the namespace/class locations on the JavaME framework of those comparative CMDA / GPRS values, I'll make it a really nice dinner!

**Dinner and dancing is pending approval from my fiance who most likely will ask me to take her instead of you, but it's the thought that counts right?