HKLM
This variable is the alias for the HKEY_LOCAL_MACHINE registry root and is used to abbreviate the registry hive name HKEY_LOCAL_MACHINE in registry paths.
Usage
Used internally by InstallMate. You can refer to this variable as <HKLM>. It is normally used as part of a registry path, as in <@<HKLM>\...remainder of path...>. This variable is read-only; do not try to change it.