What does this alert mean and how do I disable "sharing"?

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i'm here, there, everywhere i can't be seen i'm al
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2.16 GHz Core 2 Duo
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cwa107


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Basically you're on a network with another computer that has the exact same host name. You can't have two machines on a network that uses DNS with the exact same host name. Your options are to either change the host name (done as described in the alert dialog box), or pull one of the two machines off that network.
 

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