Added in 3.1
$playerhandle
Returns the window handle to the current running media player.
Example
alias np {
  if (!$playerhandle) {
    echo $color(info) -agt Media Player is not running.
    return
  }
  if (!$song) {
    echo $color(info) -agt Media Player is not playing.
    return
  }
  !np $1-
}