tclpipe is a package, which implements pipe channels for Tcl 8.4 or 8.5 where they aren't implemented out of the box.
Konstantin Khomoutov adapted code from TIP-304 and made MS Windows binaries.
Requires Tcl 8.4 or 8.5 (see ActiveTcl Home Page). Tcl 8.6 has chan pipe command for this purpose.
As an alternative, pipe command from TclX 8.4 package can be used for pipe creation.