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I clicked and see the operating system screen, but how can I use a console?, there are only ads at the sides.

I am not sure what 'ads' you are referring to, we don't have ads anywhere on our websites and demos.

Anyway, click on the "Apps" button on the top menu, then click on "Terminal". An xterm session will open for you.

You could be interested in the terminal-only version of WebVM, based on Debian: https://webvm.io

app -> terminal