o.k well i no where the vagcom is now (after asking on here lol)
but i wanna no more but in simple form, not complecated links that will confuse me 
so i no you connect the vagcom to a computer and it gives you codes ect
what comp do you attach it to? and if they come up in code format do you have a book that tells you what is what or is that on the computer too??
You can connect to a home laptop you can read fault codes and change things like:
Turn off passenger airbags, make the car auto lock when you drive off, Make the alarm beep when you arm it etc etc...
You learn how to use it just buy using it TBH

ha just beat me to it gtitdi lol