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```
myprog1 &
myprog2 &
wait
```

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  my $pid1 = open(PIPE1, "myprog1|");
  my $pid2 = open(PIPE2, "myprog2|");
...
  my $output2 = <PIPE2>;  # this works as well
  close PIPE1;  # this fails!
  close PIPE2;  # this fails as well!