# Questions about indicators

| Question                                                                                                                                                    | Answer                                                                                                                                                                                                                                    |
| ----------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Can I write indicators myself?                                                                                                                              | Yes, you can write them in the C# language. Examples with code are available in the [following section of the documentation](https://support.tiger.trade/v/english/development-for-tiger.trade-windows/indicator-examples).               |
| Which folder should I add the custom indicators to?                                                                                                         | You should add custom indicators to the folder C:\Users\\%USERNAME%\Documents\TigerTrade\Indicators. After adding it to the folder you should restart the terminal, afterwards the indicator will be displayed in the list of indicators. |
| Can I use indicators created for Tiger.com Windows in some third-party terminals or in Tiger.com macOS App?                                                 | No, they are created only for use in the Tiger.com terminal.                                                                                                                                                                              |
| What connections can be configured to view data for the [Open Interest](/english/windows/chart/main-indicators-in-chart-window/open-interest.md) indicator? | Open interest indicator is supported for all the symbols that are available in Tiger.com Windows via the [connections](/english/settings/connections.md).                                                                                 |
| How can the [Open Interest](/english/windows/chart/main-indicators-in-chart-window/open-interest.md) indicator turn negative?                               | The indicator turns negative if open interest decreases compared to the previous period.                                                                                                                                                  |
| What should I do if the [Heatmap indicator](/english/windows/chart/main-indicators-in-chart-window/heatmap.md) is not displayed?                            | Select [clusters ](/english/windows/chart.md)as the data type or turn on the Auto Select Data Type. Please note that the indicator starts showing data from the datetime when it was added on the chart.                                  |
| What should I do if the Volume Profiles indicator is not displayed?                                                                                         | Change the data type to clusters and the price increment to 100 or 1,000. Or (if required) extend the vertical scale as shown below (clickable).![](/files/eLNkxeMa7D74oXJmGnng)                                                          |


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