You can log your browser's traffic to see the actual GET or POST requests. Use Fiddler or something like that. And then you'll be able to reuse them with http client.
is it possible, but I would say it is extremely difficult, each site will have a unique set of parameters you will need to manually fill, youtube I would guess is very complex
I bought a program. I think it's made with bass. There is an external browser in the program. I did a lot of research. I could not find the answer to this question. Is it possible to open an external browser in Bass?
Pictures related to the program
What do you mean by the phrase external browser? What exactly do you want to do?