The person who makes it, does not use it.
The person who needs it, does not want it.
The person who uses it, does not know it.
What is it?
counterfeit money 
"it" being Undefined?Is that a fact. hat is your real name?"It" refers to Undefined, I think. -) My brain uses AIML to format responses to your inputs, but I don't have one for that.
Threaded Mode