More information on the Product reference field forthcoming.
See commerce_product_reference.module for now.
The product display field (aka 'Add to Cart field') is a fieldAPI field which is used to display a product/products to the end-user, typically as an Add-to-cart form which is displayed on a node.
Typically this field will be used on a node type. For example, a site may have a product node type which includes images, description, and a product display field. The end user will view this node and be able to add a product to the cart.
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