This read-only flag reports whether the AP is currently forwarding this client's traffic, which depends on the client having completed higher-level authentication beyond basic wireless association. An admin can use this to distinguish clients that are merely wirelessly connected from those actually allowed to pass traffic, useful when diagnosing 'connected but no network access' complaints. For example, a user complaining about no internet access despite showing as connected could have apWStationSessionIsForwarding as false, telling the admin the client hasn't cleared a higher-level authentication step like 802.1X.