# Use DREADD

The DIH accepts the `DREADD` indexing action, which allows you to send data (that is accessible to the DIH through the file system) directly to the DIH for indexing. Use the following action syntax:

    http://DIHhost:IndexPort/DREADD?parameters

When you send this action to the DIH instead of to an IDOL Server, note that:

- `DIHhost` and `IndexPort` are the host and index port of the DIH, not of any of its child IDOL Servers.
- In mirror mode, DIH sends the data to every child IDOL server for indexing. In simple non-mirror mode, the DIH decides which IDOL server receives index data, but all IDOL servers receive all actions. Use reference-based indexing or `DistributeSendMinimal` to further reduce the amount of traffic and IDOL Server load by allowing the DIH to distribute index data and index actions.
- When you use the `PreserveDREADD` configuration option, all the child servers must have access to the index file.

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