> ## Documentation Index > Fetch the complete documentation index at: https://docs.trypillow.ai/llms.txt > Use this file to discover all available pages before exploring further. # About sessions > How the SDK manages sessions, resets identity on logout, and queues work offline. The SDK manages sessions for you. You don't start or stop them manually. A session begins anonymous, becomes tied to a user once you identify them, and resumes in-progress studies automatically. This page covers the moments where you do need to act: logout, restarting a study, and going offline. ## Reset on logout Call `reset()` whenever a user signs out. Reset clears the external ID and all user properties and rotates the SDK to a fresh anonymous session. Always reset on logout. Without it, the next person on the same device could inherit the previous user's identity and study history. ## Restart a study When you want a study the user has already started to begin again from scratch, clear its saved session. The SDK drops the in-progress reference and reloads the study fresh the next time you present it. ## Offline behavior The SDK keeps working when the device is offline. Calls you make (identifying a user, setting properties, presenting a study) are queued locally and applied when connectivity returns: * Operations are persisted to local storage, so they survive an app restart. * The queue drains automatically once the connection is back. * Operations older than **24 hours** are discarded. * Duplicate operations are deduplicated. This means you can call identification and presentation methods without first checking for a connection. ## Per-platform reference Sessions in the browser. Sessions on iOS. Sessions on Android.