|My uncle has a wired router in his office building. The ethernet cord goes up from the router (which he does NOT have access to) to his desktop in his office.|
Since this is a work environment I highly recommend your uncle talk to the powers that be before he goes ahead and does anything.
If he's allowed to, they'll be able to help him get setup. If not, checking in advance could very well save his job.
Most places of business take a dim view of employees starting up wireless networks without permission. Where I work, doing so would get you fired on the spot.
The fact that your uncle doesn't have access to the router makes me think he works in a place with a similar view towards employees taking matters into their own hands. It also tells me he's not on the IT staff (or he'd know whether or not it was allowed and whom to talk to about it) and definitely shouldn't be messing around with this stuff.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.