During a run through Reflector to find the root cause of a bug in a WPF application, I stumbled across an internal attribute FriendAccessAllowedAttribute that is littered across many different classes, members, etc. However, I'm unable to locate what exactly uses this attribute (if anything). My guess is this is part of the C++/CLI infrastructure, but a search of MSDN, the C++/CLI spec, and the CLI spec reveals nothing. Is anybody aware of what it is used for?

.net wpf
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