Wireless will work on 7.5 or higher using the WaveLAN drivers for WaveLAN Silver or Gold cards. I don't know if any ORiNOCO drivers work on 7.5/7.6, but I doubt it. Both drivers work on the same cards, though, and as long as it isn't a CardBus card, it will probably work in the 1400.

WAP is not a possibility for Macs that cannot run OS X. 128-bit WEP encryption is the best you can do.

Peace,
Drew