[ExchangeList] creating another instance of OWA in Exchange 2k3

Hi guys,
 
Does Anyone have a comprehensive how-to on  creating another instance of OWA in Exchange 2k3?
I have a FE/BE environment covered with ISA server. I have the default OWA site up and running, SSLed.
However I find difficulty to get another instance of OWA in the environment, (so that i can have a different URL, so customers can customise it).
Any comprehensive help out there will be greatly appreciated.

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Cheers,
Gabriel

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