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  Often uses intermediate files (determined by File::Temp, and thus by the
  File::Spec defaults and the TMPDIR env. variable) for speed, portability and
  simplicity.
  
  Use extreme caution when using C<run3> in a threaded environment if concurrent
  calls of C<run3> are possible. Most likely, I/O from different invocations will
  get mixed up. The reason is that in most thread implementations all threads in
  a process share the same STDIN/STDOUT/STDERR.  Known failures are Perl ithreads
  on Linux and Win32. Note that C<fork> on Win32 is emulated via Win32 threads
  and hence I/O mix up is possible between forked children here (C<run3> is "fork
  safe" on Unix, though).
  
  =head1 DEBUGGING
  
  To enable debugging use the IPCRUN3DEBUG environment variable to
  a non-zero integer value:
  
    $ IPCRUN3DEBUG=1 myapp
  
  =head1 PROFILING