Search notes:

Registry: HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\KEY_homename

The registry key for the Oracle home named homename, on Windows.
Apparently, the name of this key is stored in %ORACLE_HOME%\bin\oracle.key
Some values include
MSHELP_TOOLS
NLS_LANG
OLEDB
OLEDBOLAP
ORACLE_BASE
ORACLE_BUNDLE_NAME
ORACLE_GROUP_NAME Oracle - homename if vaue of ORACLE_HOME_NAME = homename.
ORACLE_HOME The root directory of %ORACLE_HOME%.
ORACLE_HOME_KEY
ORACLE_HOME_NAME Name of the Oracle home described by this registry key (Homename for KEY_homename is homename).
ORACLE_HOME_READONLY New in 21c? Determines if Oracle Home is read only and ORACLE_BASE_CONFIG is used for configuration etc.
ORACLE_HOME_TYPE
ORACLE_SVCUSER
ORACLE_SVCUSER_TYPE
ORACLE_SVCUSER_PWDREQ
RDBMS_ARCHIVE
RDBMS_CONTROL
SQLPATH Location of SQL Scripts?, compare with files for SQLPATH. The location of the init.ora file under dbs?
ORA_<sid>_AUTOSTART If database is opened(?) when OracleService<sid> service is started
ORA_<sid>_SHUTDOWN How an instance is shut down when the OracleService<sid> service is stopped, possible value: immediate)
ORA_<sid>_SHUTDOWNTYPE
ORA_<sid>_SHUTDOWN_TIMEOUT

See also

The subkey OLEDB
While HKLM\SOFTWARE\ORACLE\KEY_homename stores entries that relate to an «ordinary» Oracle home, the keys HKLM\SOFTWARE\ORACLE\ODP.NET and HKLM\SOFTWARE\ORACLE\ODP.NET.Managed store entries that are related to ODP.NET.

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