Read original post by Peter Foot at AppaMundi
This article follows on from the last post on NFC to dig a little deeper on Windows Phone and Windows 8 (both of which share the same APIs for NFC).
Requirement or just Capability
In Windows Phone you have to add the ID_CAP_PROXIMITY capability to your app to use NFC. What about the ID_REQ_NFC requirement? Well the difference here is that when you specify a requirement the app will only be made available to devices with that feature. Whether you use the requirement therefore depends on whether NFC is core to your application or is an optional feature. This means it is valid to submit an app with NFC capabilities to devices which don't have the hardware [...]