ANSWER: On the localhost machine, we have to use IPC. The callbacks channel
had to be created in code, but the remoting proxy channel can be configured
in the config file. A key piece was the attribute
authorizedGroup="Everyone", required on both IPC channels.
Since we have other identical remoting connections to other machines, a
TrackingHandler was required to search the ChannelData when an object was
being marshaled and remove the IPC channel from the list when the target is
on a different machine. That is probably the most complicated part. The
rest is very straightforward.

/// <summary>
/// The TrackingHandler is used for customizing a Remoting connection.
/// This one removes references to any IPC channel unless the connecting
/// object has been registered to allow an IPC connection.
/// </summary>
public class IpcTrackingHandler : ITrackingHandler
{
List<object> allowInIpcChannelList = new List<object>();

public void AllowThisInIpcChannel( object o )
{
allowInIpcChannelList.Add(o);
}

// Called when the tracked object is marshaled.
public void MarshaledObject( Object obj, ObjRef objRef )
{
if (!allowInIpcChannelList.Contains(obj) && objRef.ChannelInfo !=
null)
{
List<object> replacementChannelData = new List<object>();
// Copy ChannelData except for any IPC store
foreach (object data in objRef.ChannelInfo.ChannelData)
{
bool okToAdd = true;
if (data is ChannelDataStore)
{
foreach (string uri in
((ChannelDataStore)data).ChannelUris)
{
if (uri.StartsWith("ipc"))
{
okToAdd = false;
break;
}
}
}
if (okToAdd)
replacementChannelData.Add(data);
}
objRef.ChannelInfo.ChannelData = replacementChannelData.ToArray();
}
}

// Called when the tracked object is unmarshaled.
public void UnmarshaledObject( Object obj, ObjRef objRef ) { }

// Called when the tracked object is disconnected.
public void DisconnectedObject( Object obj ) { }
}

"Doug Semler" <dougsemler@gmail.com> wrote in
news:#yjh9KhAIHA.4844@TK2MSFTNGP02.phx.gbl:


[quoted text, click to view]


I used option #2:

http://www.codeproject.com/csharp/RemotingAndEvents.asp