# Concurrent Sessions Limit Exchange regulations restrict the number of the maximum concurrent user sessions to one device (browser).\ \ A user can only be logged in on one device at a time, including PC, mobile, etc. Attempting to log in on a new device will disconnect you from other devices. Note: you are allowed to have multiple browsers windows open on a single device using 'tabs', so long as it is the same browser version across all, as explained [here](/getting-started/custom-layouts.md#multiple-windows). --- # 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://help.topstepx.com/getting-started/concurrent-sessions-limit.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.