Win32::Socketpair did the trick. Apparently pipes aren't handled well when redirecting STDIO.

The module does exactly the same thing to redirect the STDIN/STDOUT that I tried without success. The big difference was that it was using a network socket instead of a pipe.

For the record, I did have to set the handles to autoflush in both the client and server code in order for things to work properly.

Thanks for your help. 

# In the server:
    use IO::Handle;
    my @command = ( 'perl', 'client.pl' );
    my ($started, $fd)= winopen2( @command );
    $fd->autoflush;

# and the client:
    use IO::Handle;
    STDIN->autoflush;
    STDOUT->autoflush;

    print "$_" while <>;

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TGI says moo

In reply to Re^4: Win32 Perl: inheriting redirected STDIN and STDOUT in a child process (select) by TGI
in thread Win32 Perl: inheriting redirected STDIN and STDOUT in a child process by TGI

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