Sharing via NFC amongst Windows Phones is not an issue. Sharing across devices is not so cut-and-dry and this app is meant to exclusively bridge the gap between Samsung Windows Phone devices and Android devices.
The description does not denote that those Android devices should be Samsung branded devices, but we are sure that Samsung expects some benefit from that circumstance. That, and the reality that Samsung rules the Android market share pretty much assures such a benefit.
The interface is straight forward, just make sure your ATIV S or ATIV Odyssey has “tap+send” turned on in the settings and the rest is easy. ATIV Beam is for Windows Phone to Android devices only, so you will not need it for sharing with other Windows devices. Click on the source link to get it for your Samsung Windows Phone ATIV device.
source: ATIV Beam (Windows Phone Store) via WPCentral