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I was resisting a reply but if the variable is not used in the program, why do you care what value it has?
Suppose you had a program that totals up all invoices for the day, and it crashed, and you were trying to find out why... You talk to the user in accounting who normally runs this, and she says "there were some issues with customer #1234. Is that what's causing it to crash?" So you try to look at the customer number when it crashes.
But, the program doesn't use the customer number because the program just want's a total of all invoices for the day. So the customer number field displays zeroes.
Just one example...
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