Keeping internet GPRS connection while closing the lid of the powerbook

I fixed the bluetooth problem that my connection to my Internet access provider was hanging evry 2-3 mn by properly stting the preferences in PPP options.
Now when I am travelling for a quite long train period I would like to close the lid without deconnecting, and the same would be also nice for iTunes, I would like to be able to keep listening music while the lid is closed. How to have those activities on while the rest is sleeping?
The same would be true for an iChat session running that depends on the existence of the internet connection.
Is there any way to do that by setting properly some additional functions?
Thanks for any help.

There are programs available that'll allow you to prevent your laptop from sleeping when closing the lid. Not recommended though, since the cooling airflow is thus interrupted and the computer will therefore heat up the screen alongside other sensitive components.
I'd suggest switching bluetooth and airport off, reducing the performance of the cpu (in "energy saver") and lowering the brightness of the display. This'll keep you running for up to three hours, provided you don't try to play dvd's, on a 15" PB. the 12"'s have been known to last a bit longer.
Otherwise, get an iPod
B.

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Keeping internet GPRS connection while closing the lid of the powerbook

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