Depends on what you mean by visible and also depends on what firewall software you have setup and how it is configured.
I am pretty much a novice with all this so have (at least) one question. When I connect to someone else’s wifi, is my computer visible to anyone on that same system?
I can think of major security concerns that could result.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.