Remote Access Cain & Abel??

sorry re-posting under new heading
Okay so i have located the IP address of acomputer i would like to gain access to. it is on a un******* wireless connection. it is not running all the time. usually only at night.
what appraoch should i take to gain access. i am actaully looking for a password.
i am out of their region so i am not sure if a cain & abel or ettercap wll work.
can someone point me to some great articles. or would someone like to coach me on this one, i am trying to learn as fast as possible but could use some good mentorship.

any thoughts????