# External Parameters Definition

This section provides functions to define and manage external parameters for indicators. These functions allow you to add options, set ranges, and configure parameters.

***

## Available Functions

* [`RegOption`](/fto-indicators-docs/external_parameters_definition/reg-option.md): Registers an option for an indicator.
* [`AddOptionValue`](/fto-indicators-docs/external_parameters_definition/add-option-value.md): Adds a value to an option.
* [`SetOptionDigits`](/fto-indicators-docs/external_parameters_definition/set-option-digits.md): Sets the number of digits for an option.
* [`SetOptionRange`](/fto-indicators-docs/external_parameters_definition/set-option-range.md): Sets the range for an option.

***

Click on any function name to view its detailed documentation.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://fto-2.gitbook.io/fto-indicators-docs/external_parameters_definition.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.