NComputing PC Expanion L120 - Manual (Page 24)

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Please select the 'On Line – Unregister by Internet', and then click
on the <Next> button. 1
Unregistration
After registering the serial number, if you wish to replace the computer
which is currently being used with a new computer, or to modify the hard
disk, the serial number must be unregistered before cancelling the
installation of the NCX-2000-XP program.
Unregistration of the product via the Internet
This option is used to unregister the corresponding serial number in the
instance where the serial number was registered by using the 'On Line -
Register by Internet'. If the 'On Line - Register by Internet' option is used
for the registration of the serial number, please use the option to
unregister the serial number.
Please select the serial number with which you wish to unregister,
and then click on the <Next> button. 2
A window for the user's registration information appears. Please click
on the <Back> button to correct the information, or click on the <Next>
button to continue the registration. 3