This feature is called canvas, you can create one by clicking in this button

I think it is obsidian

Thinking about it, this really looks similar

Yes, it’s basically like it, but i don’t think it would be possible just from a web browser

Sometimes when I put my phone in my pocket, it keeps touching the screen. I think that was what happened

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I am pretty sure a link file can open cmd/powershell with parameters to execute commands