I have a stationary computer so it will be too heavy for me to carry to a friends house or a cafe since I don' have a car.
I will however try the things you mention and let you know if they work! ♥
If you have a cellphone with internet, you can use your cellphone as a temporary Wi-Fi hotspot for internet connectivity. You might have to do a web search on how to do that with your specific cellphone.
To add, not all the desktop PCs can use WiFi, most of them use a cable instead. Laptops usually do have a WiFi connection option. It's good to check that as well.
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