Location of the insertion point in a field

[Mikey]

Well, I tried searching the docs.
How do I figure out where the cursor (insertion point) is in a field?
-- 
On the first day, God created the heavens and the Earth
On the second day, God created the oceans.
On the third day, God put the animals on hold for a few hours,
   and did a little diving.
And God said, "This is good."