Move the vertices via Maxscript in Edit_mesh above the XmeshLoader?

Hello all in thinkbox.
May I ask one question ? How can I move the vertices via Maxscript in Edit_mesh modifier above the XmeshLoader ?
I could not find the command about moving the vertices in Edit_mesh modifier in the document of Maxscript. Could you do me a favor, give me a very simple example ?
Thank you very much.