>I've seen this phrase used a few times. Can someone explain what it means?

I wrapper is some code that makes things easier (faster to code and quicker to understand). Instead of PRG's, wrappers became more popular with an Object interface, particulary (but not only) non-visual classes.

An example you say? Say when ever you want o open a table exclusivly, you don't want an error if it fails, just a return value. So you write a reusable wrapper for the use statement:

*UseEx.Prg
lparam tcFile
local lcError

lcError = on('Error')
on error *

if file(forceext(tcFile, 'dbf'))
   use (tcFile) in 0 excl
endif

on error &lcError

return used(juststem(tcFile))

Then to use a file exclusivly and store its success to a variable, do:

llOpen = UseEx('table1')

There, now you have "wrapped" the use statement.