[Q] USB Internet? Not Tethering I guess..

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I'm running ansar's Tango ROM currently and I never noticed this 'feature' before. I do NOT have any reception at work.. and I barely can get a 1x connection if I put my phone 46 degrees NNE of the window beside the stockroom(just saying here... no signal at all here lol). But anyway, I was connecting my HTC Trophy(Verizon) to the computer to sync some apps through ZUNE. Tested an app and noticed that I could get on the internet with my phone while connected to the computer. In otherwords, Reverse USB Tethering I guess. Like my phone was pulling internet from my computer here at work. Make sense?

Is this a standard WP7 Feature? or is this something ansar put in the Tango ROM? I was just wondering because this is an OMFG BEAST feature to have due to bad reception(and I do mean BAD) at my work area. Thanks.

Edit:
Might I add this as well.. If you disable the 'sync' screen in the WPTweaks app, you can download apps WAY faster by connecting USB then then downloading the app.

My phone has always pulled internet from my phone when connected via Zune, even on stock software

Thanks, I never noticed. I wonder how it works? is it the driver on the kernel or something?