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From Odwiki

The configuration page of the operator type manager controls how .otl files are loaded, in what order, and what to do if there's an exception. There are six entries:

Operator definition priorities:

1. Give Preference to Definitions from Index Files
2. Give Preference to Definitions Saved in Hip Files
3. Give Preference to Definitions with Latest Date

Embedded operator type library:

1. Save Operator Definitions to Hip File
2. Display Warning for Out of Date Operators
3. Create Backup Files when Saving Libraries

As of Houdini 6.1, the results of this page are stored instantly in your home directory (~/houdini, ~/houdini6, or ~/houdini6.1, depending on your HOUDINI_PATH) in a file called hopmanager.pref. This can be quite dangerous, as any jobs on your render queue will be instantly affected by these changes. There are numerous OTLPitfalls to keep in mind.

Preventing the user from modifying the Configuration

It's possible to create one of these files in your distribution with name hopmanager.pref.nosave. If this is encountered, the preferences inside the file will be read but forbids the user to change them. This is especially useful for larger installations where it becomes very necessary to ensure all animators have a consistent/identical environment. Please be aware that if you have a hopmanager.pref file somewhere further up your HOUDINI_PATH before the hopmanager.pref.nosave file, that it will still allow editing as before, so take care to remove all hopmanager.pref files after you've created the .nosave file.