Something about storing data into sessions.

Is storing session data going to affect app usage if there are multiple users using the same app.
For example, if User A uses the app and does an action (that causes a certain piece of data to be stored in session), is that going to sync with User B who performs the same action ? Does he see that data from User A ?

No, session data storage is linked by the session cookie managed by the individual browser. (Two tabs in the same browser are likely to share the same session cookie. Two different browsers on the same computer are likely to not share the same session.) See the Sessions doc page for more detailed information.

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