C:\WINDOWS\system32>reg copy /?
REG COPY KeyName1 KeyName2 [/s] [/f] [/reg:32 | /reg:64]
KeyName [\\Machine\]FullKey Machine Name of remote machine - omitting defaults to the current machine. Only HKLM and HKU are available on remote machines. FullKey ROOTKEY\SubKey ROOTKEY [ HKLM | HKCU | HKCR | HKU | HKCC ] SubKey The full name of a registry key under ...