How to open a specific vault from outside Obsidian?

Hey first of all thank you so much for your thorough example, I can confirm that it has worked as I wanted it to.

Just a final question, How did you know about this specific way to use obsidian? I am not as savy as most when it comes to these things, I usually default to the docs and if nothing I try the good old Program.exe -help in this case neither helped.

I would love to know if there some place where similar commands are documented, it would help allot. Thanks again.