https://learn.microsoft.com/en-us/dotnet/api/system.net.peertopeer.pnrppermission.union?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
PnrpPermission.Union(IPermission) Method (System.Net.PeerToPeer) | Microsoft Learn
Creates a permission that is the union of the current PnrpPermission and the specified permission.
unionmethodsystempeertopeermicrosoft