Renamed to ThreadPoolMarshaller.

src/NTwain/ThreadMarshaller.cs

@@ -30,10 +30,10 @@ namespace NTwain
     }
 
     /// <summary>
-    /// Doesn't actually use any particular thread. 
+    /// Async calls are marshalled to threadpool thread. 
     /// Should only be used in non-UI apps.
     /// </summary>
-    public class NoParticularMarshaller : IThreadMarshaller
+    public class ThreadPoolMarshaller : IThreadMarshaller
     {
         public bool InvokeRequired => throw new NotImplementedException();
 

src/NTwain/TwainSession.cs

@@ -29,7 +29,7 @@ namespace NTwain
                (uint)(DG.APP2 | DG.IMAGE),
                country, "", language, 2, 4, false, true, HandleDeviceEvent, HandleScanEvent, HandleUIThreadAction, hWnd);
 
-            _threadMarshaller = threadMarshaller ?? new NoParticularMarshaller();
+            _threadMarshaller = threadMarshaller ?? new ThreadPoolMarshaller();
             _hWnd = hWnd;
         }