Add note about thread safety (#10848)

Author: gewarren

xml/System.IO.Pipes/NamedPipeServerStream.xml

@@ -52,14 +52,18 @@
       <format type="text/markdown"><![CDATA[
 
 ## Remarks
- Named pipes provide one-way or duplex pipes for communication between a pipe server and one or more pipe clients. Named pipes can be used for interprocess communication locally or over a network. A single pipe name can be shared by multiple <xref:System.IO.Pipes.NamedPipeClientStream> objects.
 
- Any process can act as either a named pipe server or client, or both.
+Named pipes provide one-way or duplex pipes for communication between a pipe server and one or more pipe clients. Named pipes can be used for interprocess communication locally or over a network. A single pipe name can be shared by multiple <xref:System.IO.Pipes.NamedPipeClientStream> objects.
+
+Any process can act as either a named pipe server or client, or both.
+
+With regards to thread safety for reading and writing, up to a single reader and a single writer can use an instance concurrently.
 
 ## Examples
- The following example demonstrates a way to send a string from a parent process to a child process on the same computer using named pipes. This example creates a <xref:System.IO.Pipes.NamedPipeServerStream> object in a parent process with a <xref:System.IO.Pipes.PipeDirection> value of <xref:System.IO.Pipes.PipeDirection.Out>. The server then waits for a <xref:System.IO.Pipes.NamedPipeClientStream> object in a child process to connect to it. In this example, both processes are on the same computer and the <xref:System.IO.Pipes.NamedPipeClientStream> object has a <xref:System.IO.Pipes.PipeDirection> value of <xref:System.IO.Pipes.PipeDirection.In>. The parent process then sends a user-supplied string to the child process. The string is displayed to the console.
 
- This example is for the server process, which uses the <xref:System.IO.Pipes.NamedPipeServerStream> class. For the entire code example, including the code for both the pipe client and server, see [How to: Use Named Pipes for Network Interprocess Communication](/dotnet/standard/io/how-to-use-named-pipes-for-network-interprocess-communication).
+The following example demonstrates a way to send a string from a parent process to a child process on the same computer using named pipes. This example creates a <xref:System.IO.Pipes.NamedPipeServerStream> object in a parent process with a <xref:System.IO.Pipes.PipeDirection> value of <xref:System.IO.Pipes.PipeDirection.Out>. The server then waits for a <xref:System.IO.Pipes.NamedPipeClientStream> object in a child process to connect to it. In this example, both processes are on the same computer and the <xref:System.IO.Pipes.NamedPipeClientStream> object has a <xref:System.IO.Pipes.PipeDirection> value of <xref:System.IO.Pipes.PipeDirection.In>. The parent process then sends a user-supplied string to the child process. The string is displayed to the console.
+
+This example is for the server process, which uses the <xref:System.IO.Pipes.NamedPipeServerStream> class. For the entire code example, including the code for both the pipe client and server, see [How to: Use Named Pipes for Network Interprocess Communication](/dotnet/standard/io/how-to-use-named-pipes-for-network-interprocess-communication).
 
  :::code language="csharp" source="~/snippets/csharp/System.IO.Pipes/NamedPipeServerStream/Overview/Program.cs" id="Snippet01":::
  :::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR_System/system.IO.Pipes.NamedPipeServerStream_Sample1/vb/program.vb" id="Snippet01":::