> This question has probably been asked before
Yes, thousand of times :-)
> is there a way to check if a computer is connected to the internet?
There is no universal way to know if a computer is connected to the internet
because there are so many ways to be connected. There are only ways specific
to a given type of connection using a give type of hardware.
You should better specify what type of connection you want to test.
Note: You can simply try to connect where you have to connect and see if it
is successful or not.
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