improved diagnostics, comments

projects/UdpExample1/UdpSender/src/udpsender/UdpSender.java

@@ -49,7 +49,7 @@ public class UdpSender
             // that you haven't received a duplicate UDP packet, out of
             // order packet, or dropped packet?
             
-            for(int idx = 0; idx < 100; idx++)
+            for(int idx = 0; idx < 100; idx++) // avoid infinite send loops in code, can be hard to kill!
             {
                udpSocket.send(packet);
                Thread.sleep(1000); // Send 100, one per second