Well, actually one is a PC with Windows XP, and the other is a Dell Axim X5 Pocket PC with a CF wireless card and with windows for PPC OS. The encripton on my PC wireless card seems to be 128 bit WEP, but I can change it, and my PPC card comes with 128 bit by default, and I cannot change it. And my wireless card seems to support ad-hoc too... got to search on my PPC.