gistfile1.n

handle mousedown(down) {
  handle mousemove(move) until mouseup {
    ....
  }
}

handle keydown(k0) {
  if(k0 == 'a') {
    handle once keydown(k1) {
      if(k1 == 'b') {
        handle once keydown(k2) {
          if(k2 == 'c') {
            alert('hooray!');
          }
        }
      }
    }
  }
}