You can install a PCI wireless card in the desktop computer or you can use an USB wireless device. Both of these devices can connect to your wireless router, but they need to be configured with the router's wireless settings. If you do not have a wireless router, then you can get an USB wireless modem device that connects to the Internet that uses the 3G mobile network. The advantage of this, you can connect to the Internet anywhere you get mobile coverage with that Internet Service provider.
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You can install a PCI wireless card in the desktop computer or you can use an USB wireless device. Both of these devices can connect to your wireless router, but they need to be configured with the router's wireless settings.
If you do not have a wireless router, then you can get an USB wireless modem device that connects to the Internet that uses the 3G mobile network. The advantage of this, you can connect to the Internet anywhere you get mobile coverage with that Internet Service provider.