You can delete unnecessary computers from Network Scan Destination of Scan To Computer of the machine.
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Click [Start], and then select [All Programs] > [Okidata] > [ActKey] > [Tools] > [Network Configuration].
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Right-click [Show Network Configuration] in the task tray.
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Select [Properties] from the [Scanner] menu.
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Click the [Unregister] tab.
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Select the computer name to unregister, and then click [Unregister].