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use Library;

$| = 1;
Library::createProcess('second application');

use Library;
select((select(STDOUT), $|=1)[0]);
...
print STDERR  "   -> Err \n";

Library::createProcess('random application');

use IO::Select;
use IPC::Open3;
...
        }
   }
}

Out
Out
...
    -> Err
    -> Err
    -> Err