Peter, it really depends upon what you want to do, and whether you're willing to purchase any new accessories.
With your existing hardware, you basically have to get your PC to either pretend to be a wireless hotspot itself (if it has WiFi support), or pretend to be an Ethernet router that is connected to the Internet (as Steffen said).
Alternative options include:
* Buying a 3G version of the iPad and connect your iPad directly to the Internet. (This is less handy if you want your PC to also have Internet access, unless you get two separate accounts.)
* Buying a 3G-compatible WiFi/Ethernet router/modem which can connect directly to the Internet with a SIM card - i.e. the USB dongle wouldn't be needed. (This is less portable, as you just can't it with you as easily as with the USB dongle.)
* If you have a phone that has 3G and WiFi, you can just create a personal hotspot and connect your iPad to the Internet via the phone. (Data plans tend to be more expensive this way, and it sucks the phone's battery dry very quickly.)
* Buying a portable 3G<->WiFi sharing device. This is the option that I use - I just turn it on, and it creates a WiFi network that all my devices (laptops, iPhone, iPad) can connect to. Mine came with my Telstra prepaid plan - it's smaller than my iPhone, and plugs into any USB port to recharge.
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