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2 Double-click the Control Panel icon. 3 Double-click the Network icon. 4 Select the 3Com Megahertz LAN PC Card. 5 Click Properties. 6 Click Advanced. ¦ For network driver optimization, click DOS Client or Windows or OS/2 client or server. ¦ For full duplex, click enable to use full duplex and disable if you do not want to use full duplex. Only use full duplex if you have a full duplex network. ¦ For NDIS driver version, click auto-select, NDIS 3, NDIS 4, or NDIS 5. NDIS 5 only works with Window