title: How to port TCPClient and NetworkStream to Silverlight?
body: <p>Why are TCPClient and NetworkStream missing from Silverlight?<br>
  Are there any known ports of TCPClient and NetworkStream to Silverlight?<br>
  If there aren't, am I allowed to copy the source code from the .NET 4 runtime into my own library?<br>
  If not, how do I start porting those classes to Silverlight?</p>