The REG COMPARE command.

REG.EXE, built into Windows XP, Windows Server 2003, and later operating systems, or installed from the Windows 2000 Support Tools, has a COMPARE command.

When you type: REG COMPARE /?, you receive:

REG COMPARE KeyName1 KeyName2 \[/v ValueName | /ve\] \[Output\] \[/s\]

  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
             If FullKey2 is not specified, FullKey2 is the same as FullKey1
    SubKey   The full name of a registry key under the selected ROOTKEY
  ValueName  The value name, under the selected Key, to compare
             When omitted, all values under the Key are compared
  /ve        compare the value of empty value name 
  /s         Compare all subkeys and values
  Output     \[/oa | /od | /os | /on\]
             When omitted, output only differences
    /oa      Output all of differences and matches
    /od      Output only differences
    /os      Output only matches
    /on      No output

Return Code:

  0 - Succussful, the result compared is identical
  1 - Failed
  2 - Successful, the result compared is different


  REG COMPARE HKLM\Software\MyCo\MyApp HKLM\Software\MyCo\SaveMyApp
    Compares all values under the key MyApp with SaveMyApp

  REG COMPARE HKLM\Software\MyCo HKLM\Software\MyCo1 /v Version
    Compares the value Version under the key MyCo and MyCo1

  REG COMPARE \\ZODIAC\HKLM\Software\MyCo \\. /s
    Compares all subkeys and values under HKLM\Software\MyCo on ZODIAC
    with the same key on the current machine

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