> For the complete documentation index, see [llms.txt](https://fto-2.gitbook.io/fto-indicators-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://fto-2.gitbook.io/fto-indicators-docs/external_parameters_definition.md).

# 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.

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## 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.
* [`SetOptionStep`](/fto-indicators-docs/external_parameters_definition/set-option-step.md): Sets the step size for a numeric option in the settings UI.

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Click on any function name to view its detailed documentation.