Referring to a mc inside an mc

Well, the title really states what I want to know. If you have a Movie clip inside another Movie clip. Can you refer to that one from another movie clip on the screen.
eg.

  1. A MC called “Player”
  • inside “Player” is another MC called “weapon”
  1. Player is placed onto the screen and another MC is placed on the screen called “sword”

  2. When the player touches the MC called “sword”. The movieclip called “weapon” - gotoAndPlays frame 2 inside it.

Note: I haven’t really made a flash like above. It’s just an example.
:trout:
I refer to _root.sword from inside the MC called “weapon” but how can I refer to the MC called “sword” from inside the MC “weapon”.
Does it use a file path? eg. _root.Player/weapon?
Does anyone know?