After troubleshooting battery problems on my iBook, I asked technical support about this. They said that even though the network connection is disabled during sleep that the airport card draws power unless you turn it off. In other words, you will not be vulnerable to transmissions, but it will drain your battery if you do not turn it off from the menu bar. Hope that helps! Valerie On 11/9/04 8:52 AM, "MTH" <nikon80x at mac.com> wrote: > I'm pretty sure that the iBook does not transmit while close but if you > want to be positive that it is not, just go up to the menu bar and turn > off your airport before you close your iBook.