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# Distribute IDOL Actions

The main function of the DAH is to distribute actions to its child servers to query them. The DAH can distribute different actions depending on whether you run it in mirror or non-mirror mode:

- If you run the DAH in mirror mode, it can distribute all ACI server actions. Refer to your product Reference (for example, the IDOL Server Reference) for a complete list of actions.

- If you run the DAH in non-mirror mode, it can distribute the following IDOL Server actions:

`DetectLanguage` | `Query`
`DocumentStats` | `Suggest`
`GetContent` | `SuggestOnText`
`GetQueryTagValues` | `Summarize`
`GetTagNames` | `TermExpand`
`GetTagValues` | `TermGetBest`
`Highlight` | `TermGetInfo`
`LanguageSettings` |

In addition, you can use some actions to query the DAH for information about its operation (for example, to return a list of requests that were sent to the DAH, or to return license information). For details of supported actions and action parameters, refer to the Distributed Action Handler Reference.

NOTE:

For the `LanguageSettings` action, when the child servers have compatible language configurations, DAH returns the child server response, except for the `LanguageDirectory` configuration. The child server language configuration must be the same for all child servers, except for `LanguageDirectory`. If the child server configuration is not compatible, DAH returns the message `Engines returned inconsistent information`.

## Return Child Server Information

For the following actions, you can use the `PrintEngine` action parameter to return additional information for each result document that shows the child server that the result comes from.

`GetContent`
`Query`
`Suggest`
`SuggestOnText`

When you set `PrintEngine` to `True` for these actions, the response includes an `<autn:engines>` tag for each result, which includes the child server information in the format `X[.Y.Z...]`, where:

- the number of elements represents the number of levels in your DAH hierarchy
- each element corresponds to the ID of the child server that returned the response. The ID is the number of the child server in the parent configuration file.

For example, if you have a DAH, with a layer of sub-DAHs, and then a layer of child IDOL Servers, a value of `3.2` for `<autn:engines>` represents a document coming from child server 2 of sub-DAH 3 of the top level DAH.

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