public function stopInScreen($sessionName)
{
// what are we doing?
$log = usingLog()->startAction("stop screen session '{$sessionName}' on host '{$this->args[0]}'");
// get the process details
$processDetails = fromHost($this->args[0])->getScreenSessionDetails($sessionName);
// stop the process
usingHost($this->args[0])->stopProcess($processDetails->pid);
// all done
$log->endAction();
}