from:
http://www.rta.nsw.gov.au/registration/regotransfer/buyingavehicle.html-------------------------------
Buying a vehicle
When you buy a vehicle
Before you buy a vehicle, you should:
Check the registration and CTP insurance details of the vehicle.
Online at myRTA.
Over the phone the RTA Contact Centre on 13 22 13.
Get a REVs check.
You must transfer the registration into your name within 14 days of the vehicle coming into your possession or management.
You can transfer your registration:
Online at myRTA.
At a motor registry.
For more information see how to transfer your registration
You may need to pay:
Transfer fee.
Stamp duty (unless exempt).
Additional motor vehicle tax (or national heavy vehicle charges) if you have bought your vehicle from someone receiving an RTA concession (such as a pensioner) and you are not eligible for that concession.
Late transfer surcharge. A surcharge will be applied to customers who fail to transfer the registration within 14 days of the date of acquisition.
If you have an E-Tag you should also update your number plate details with your tag provider.
Transferring and Compulsory Third Party (CTP) insurance
A vehicle's existing CTP insurance will be automatically transferred when the registration is transferred. You don't need to do anything about CTP insurance until the registration is due for renewal.
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but that means it should be possible to do the reregistration online, if i am not miss interpreting the text!