Oh, it's a lot (lot) simpler than that. Remember that TI-BASIC was designed for people with next to no previous experience in programming (many of us started in TI-BASIC, after all). Here's a brief explanation.

First off, Get and Send are not the functions you're looking for. In TI-BASIC, Get and Send receive from and send to CBL/CBR devices, not calculators. To do calculator-to-calculator linking in TI-BASIC, you use GetCalc.

GetCalc is amazingly simple to use. (After all, BASIC is a beginner's language.) Put a variable name in the parentheses, and GetCalc(VAR) grabs that variable from the other calculator (if it exists) and stores it on this one. So if you want to transfer the list L1 from calculator A to calculator B, all you have to do is run

GetCalc(L1)

from calculator B. That's it!

Well ... there is one catch. The sending calculator (calculator A) must be in "low-power mode." What this basically means is that it needs to be in some sort of standby context, for example on the homescreen or waiting for the ENTER key during a Pause in a program. In other words, it can't be actively calculating anything.

Here's a very stripped-down example of two programs (prgmA for calculator A, and prgmB for calculator B) that use GetCalc.

• Calculator A runs this first:
  
  
• Then while calculator A is in the middle of the Pause, calculator B runs this:
  
  
• The value of Str1 is now "ABC" on both calculators.

Hope this helps!

(Yay I actually used Homer!)

EDIT: Guess I should have asked you what you wanted before writing a tutorial on a totally different subject. Sorry.

Indeed, that is how one bit is sent. For the whole protocol (and more!) I recommend the TI Link Protocol & File Format Guide v1.4. It's old, but that's fine unless you want Nspire and better USB information.
Edit: Given Deep Thought's comment and calc84maniac's post, what's this doing in the TI-BASIC section?