Changes only work with characters that is offline. (With the exception of Account Table Changes such as: GM, Account Status, Revoked, and Inventory.)
You can view any character at any time no matter if they are online or offline.
If you change anything on a character while they are playing the change is simply ignored by the client because this edits the database directly. Then when the client sends changes and saves the profile to the servers database the entire profile in the database is overwritten by what the client has.
Try it out for your self and post your results......
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