# Advanced Usage ## Multiple Flipbooks In use cases where multiple flipbooks are to be embedded on the same page, small changes to the markup is required so that each individual instances will reference the correct ` ``` This iframed flipbook will then be accessible via the globally defined API instance `iPaperAPI`, just like in the single flipbook use case outlined in [quick-start](/flipbook-javascript-api/legacy-javascript-api-v2/quick-start.md). {% hint style="warning" %} **Warning:** If `data-ipaper` attribute is not added, then the default API instance will simply select the **first** ` ``` ## Event listeners and command triggers If you are more accustomed to working with event listeners and command triggers, and do not want to use magic callbacks and commands that are available via the API instance, you can simply: * add event listeners to the ` ``` --- # 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://docs.ipaper.io/flipbook-javascript-api/legacy-javascript-api-v2/advanced-usage.md?ask= ``` 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.