Dell Inspiron 5100 Owner's Manual page 73

From the Data encryption drop-down menu, select your data encryption type
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(as provided by the network administrator).
If your wireless network requires a key, enter it in the Network key field.
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Click OK.]
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Your network setup is complete.
NOTE: Your computer may take up to a minute to attach to the network.
Connecting to a Network With Wired Equivalent Protocol (WEP) Security Requirements
In the Preferred networks section, click the name of your wireless network.
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Click Properties.
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Setting Up a Home and Office Network
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