CC3200MOD: When Working as AP mode and is connected to a station, how does the other station know CC3200 at AP mode is connected?

Part Number:CC3200MOD

Dear sir,

    Our device works as an access point by the help of CC3200, working at AP mode.

When it is connected to a station, say tablet A, other tablets are not allowed to connect.

The question is: how shall the other tablets check to know that CC3200 at AP mode is already connected so that it can prevent from trying to connect to the AP mode CC3200?

Thanks for your time.

Best Regards,

Luke