Multiple pc setup, help: needed

Hey there,

My setup consists of a mid-range gaming laptop and a second pc (old lenovo) i use for watching series, films etc. I use my main laptop for gaming, discord, music, browsing and so on, but that can be a little too much for my mid-range laptop.
Do you know of any software that can let me use my second laptop for these activites?
I want to use my laptop keyboard and my mouse for both machines, and have audio in-and output in my main laptop. I do not need to share files with my second laptop, i would just use to share the load with my lenovo laptop

Any help is highly appreciated.
thanks.