Help write code that creates asynchronous control

Good day, can you show an example of how to open 2 tabs through code and in asynchronous mode constantly receive data from the page, the data on the page is constantly changing, I need to parse them, otherwise when 1 tab everything works, but if 2 then on the 2nd tab get post requests stop working when pressing buttons and js scripts in general =(

I think this is quite a broad question to answer.