# Impersonating users It is possible to impersonate users when viewing a H5P object. This means that you can display another user's user state instead of your own. This is useful, if you want to implement a feature in which teachers can review the work of students. You do this by setting `options.asUserId` of the `H5PPlayer.render` method. Make sure that you [authorize users](/advanced-usage/authorization.md) as required in the permission system. ## Read-only states In most cases in which your users impersonate another user, you'll want to disable saving the user state for the impersonator. You can do this by setting `options.readOnlyState` to true when calling `H5PPlayer.render`. This will do the following: * set the save interval to the longest possible value * adds the query parameter `ignorePost=yes` to the Ajax route responsible for handling user states The query parameter is necessary, as the H5P core client doesn't support user states that are read only. We work around this by ignoring a post calls when the query parameter is set in h5p-express. If the query parameter is set, we simply return a success, so the H5P core client doesn't realize we didn't save the state. If you don't use this package, you must do this yourself. Obviously you also have to make sure malicious users won't change the user state of others, by rejecting these operations in the authorization/permission system! ## Trying it out in the examples The server-side-rendering example supports impersonation and read-only state. You can use them by passing in query parameter in the URL, e.g. `http://localhost:8080/h5p/play/?asUserId=&readOnlyState=yes`. The REST example also supports impersonation and read-only states. You can enable these features in the web interface. ## Acknowledgement The development of this feature was kindly funded by PHYWE Systeme GmbH und Co. KG (). --- # 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.lumi.education/advanced-usage/impersonation.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.