How to get components influenced by specified influence and skinCluster

Hello.
Sorry if it is too stupid question…

How to do this in mel or python?
I’ve got a joint. Than i’m finding all skinClusters that is connected to (thats not a problem)
Then i need to find out all components influenced by this particular joint and this particular skinCluster.

The main goal is micro script that returns all components influenced by this joint in all clusters.
Select a joint, run script, script selects all vertices (in all possible geometry in scene) influenced by this joint.

Thanks.

this link was very helpful for me

http://www.charactersetup.com/tutorial_skinWeights.html

Thanks! It will help!