Help with internet sharing via wireless macbook pro and in xp pro

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Hi, need help in configuring internet sharinh via wireless from my macbook pro and my xp pro.
My mac is connected through an usb dongle.
Do i need software?
Thanks.

Arthur
 
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Your Mac's Specs
Mid 2009 MacBook Pro  Mid 2007 iMac  4G iPod Touch  iPhone 4S  iPad
What do you mean your connected through a USB dongle? Is it the modem?
 
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I'm currently sharing internet from an USB dongle 3G Modem to wireless connected computers with no extra program. It's enough to activate the Internet Sharing function in the System Preferences-> Sharing menu.Unfortunately the activation process is a little complicated:
1 - Airport must be active (System Preferences -> Network): on my MAC when the 3G connection is ON the Airport is usually disabled due to a behavior of the 3G control program (it creates a new Network Location on each connection)
2 - an ad-hoc wireless network must be created by means of the Airport Options button in the Sharing panel, PCs must connect to this network
3 - sometimes is needed to uncheck Internet Sharing and then re-check it in order to see and click a Start button, only after this I.S. is running

A further issue is that the ad-hoc wireless network does not allow to share files, printers and others. As a matter of facts is not possible to use a pre-existing network given by a wireless access-point or router (unless I'm mistaking something, corrections are welcome). This is not true when computers are connected via ethernet, here everything is working.
 

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