Ipad connect to airport express
I am new user and i have ipad 1 , new macbook air, pc with windows 7 home edition, pc with XP SP3 and new airport express. Mac and airport work ok ( airport join an existing wireless network in client mode), PCs work also ok, but Mac can not see Ipad and PCs,, and PCs cn not see MAC. Ipad only see airport speakers in Itune. I need to my MAC see PCs and Ipaf.
Could you help me?
MacBook Air