Limiting a user's simultaneous sessions

Isaac is a Wireless Internet Service Provider (WISP) and his income depends on having as many users as possible because he charges a monthly subscription. Alice is his client. She gives her credentials to Bob who lives next door and so they both connect at the same time. Isaac needs to put an end to this or else he will have to close his WISP and code HTML for food!

Limiting a user's simultaneous sessions

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