In the following archive you find C# example source code (and binaries – not from me) for a named pipe server and client under Windows. In addition you find sourcecode for a Smalltalk named pipe client under Windows. The client works together with the c# example server
After loading the repository code you may execute
MSKNamedPipe exampleWithDotNetExample
and you may find out how it works. As a prerequisite you need MSKKernel.