Why does my keyboard type everything twice in Windows?

Hello! I have a laptop with Windows 11, and suddenly all the letters in the Explorer search and the Start menu search are doubled. So, every input appears duplicated, including the backspace key. This is also the case with the on-screen keyboard. I've deleted unnecessary programs, checked all settings, and reinstalled drivers. Sometimes no letters…

Can you use a mouse and keyboard with two or more PCs simultaneously? Without software?

I would like to implement a solution for part of my project that allows me to download different programs to multiple PCs at the same time without having to perform the actions on each PC individually. Ideally, mouse and keyboard actions could be executed synchronously on all affected PCs. This means that the actions on…