Yes partly, but different users could also be sending to the server at the same time and the browser window(s) are also sending and receiving continuously to the server.
The change I mentioned in the post #41 was to with this - what it does is queue up server requests and handles them one a time in the order they appear at the server, so you are OK to send requests from any thread.
So there is no issue from the server's point of view, but if you use Timer threads you cannot be sure of the order of requests with respect to calls made on the UI thread, so my later examples moved away from using the Timer thread and uses the logic I mentioned in post #44.
The change I mentioned in the post #41 was to with this - what it does is queue up server requests and handles them one a time in the order they appear at the server, so you are OK to send requests from any thread.
So there is no issue from the server's point of view, but if you use Timer threads you cannot be sure of the order of requests with respect to calls made on the UI thread, so my later examples moved away from using the Timer thread and uses the logic I mentioned in post #44.