Many kind thanks for your interest in our network library. The scenario you describe is easily achievable, we have successfully tested using 1000 clients where the network load is almost 100%. We are confident NetworkComms.Net could easily support 10,000+ clients, we just don’t have the resources to test that number.
The closest example included in the source download is probably the ExamplesChat.WPF application. To understand the structure of this example we also have a companion tutorial here.
If you have any further questions or issues please feel free to post back.