When is the H4 visa will be forfeited?

My family got the visa stamp since September 2006 and I heard that if they will not come here in US the VISA will be forfeited. Is this true? Would you know any links that explains this.

Thanks!

Answer:
Visas are valid for the full length of time specified on them. They are not 'forfeited' if they are not used, until they expire.

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