Connection reset / aborted

[Clinton Gormley]

I recently got this error message:

  Apache2::RequestIO::print: (104) Connection reset by peer at .........

from the code: 
  $r->print($data);

I understand why, but it raised two questions:
1) What is the difference between connection reset and connection
   aborted
2) What return code should I send Apache2::Const::OK? or what

thanks

Clint