About HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet contains the following keys:
               
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Control
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Enum
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HardwareProfiles
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Services
 
The first three are used by the operating system. You can edit only the Services subkey, which contains Parameters for Oracle Database Services.
               
- Parameters for Oracle Database Services
HKEY_LOCAL_MACHINE\SYSTEM\CURRENTCONTROLSET\SERVICESsubkey contains additional subkeys that correspond to each Oracle Database service. 
Parent topic: Registry Parameters Overview