About BlackBerry ID and BlackBerry Link
Your BlackBerry ID is a username (email address) and password used to access multiple BlackBerry products and
services, such as BBM and the BlackBerry World storefront. In many situations, your BlackBerry ID allows BlackBerry
products to work seamlessly without prompting you to enter your username and password.
If you don't have a BlackBerry ID and you want one, you can create it from BlackBerry Link.
When you sign in with your BlackBerry ID in BlackBerry Link or BlackBerry Blend, your computer becomes another device
that is associated with your BlackBerry ID. All your devices associated with your BlackBerry ID appear in BlackBerry Link.