The first thing you need before connecting to the Bing Maps servers is a Bing Maps developer key. The Bing Maps portal (http://www.bingmapsportal.com) allows you to create a Bing Maps account and one or more Bing Maps keys.
To request a Bing Maps key from Microsoft:
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Sign in with your Windows Live ID, or create one.
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Click "Create or view keys".
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Choose "Evaluation / Trial" and click Submit. The key is created.
Note that additional terms may apply for deployment. For more information on Bing Maps licensing, see the Licensing info guide.