apply force from a node to another node (3D)

Question

is there a way to make a line of code attached to nodea apply a force to nodeb ?
nodea with scripta
nodeb with scriptb

like a jedi, yes

i tried to write in script_a :

func integrateforces(state):
nodeb.state.addforce(forceX, Vector3(0,0,0))

or

func integrateforces(state):
state.nodeb.addforce(forceX, Vector3(0,0,0))

with no success
is it clear enough ?