Wireless Internet is available at that lounge, but you need to ask ladies at the desk.
They will give you a scrach-off card which unveil random user name and password for one day use. Once you enable your laptop wireless and launch the browser, you can tupe in them.

JAL still flies 3-class aircraft on many destination so they separate First class lounge from Business class, and CO'c BF is considered as Business class.
They change lounge location (lounge assignment to CO BF customer) time to time, so next time you moght be told to go to different lounge - but still Business class lounge.

There is no other lounge CO customer can use in Tereminal 2, at this moment. Even P Club member can't use that JAL lounge - it is BF customer only by rule or contract, but once before when I didn't clear mileage upgrade waitlist, I asked check-in agent if I can use my P-club card to get in there, then she (JAL employee) asked a supervisor (CO employee), and he said OK, but no guest allowed.

Northwest World Club is at terminal 1 beyond security, so no way to use.
IIRC the airline gate/terminal assignment shuffle is going on at NRT, in several years range, and at the end all Skyteam carriers will be on the same terminal. I don't know when. (2010 ?)

Hope this helps...