How to make a service a program that would run on a keystroke?

Question

Windows

Is it possible to make it so that it would not check each keystroke (for speed purposes), but only for one specific key (key combination).
Roughly speaking, somewhere in the OS system, there are drivers

switch(keyCode){
        case 1: ....
       case 2: ....   // функции // сюда есть ли возможность что добавить
}

Is it possible to add another feature.
To hang globally and check, for some reason does not seem to be the right solution.
Maybe in windows there are such settings in the registry, somewhere else.

Answer 1

A regular tool that solves your problem (RegisterHotKey)
https://docs.microsoft.com/en-us/windows/win32/api...
An example of using
https://www.targetprocess.com/blog/hotkeys-binding. ..
https://ourcodeworld.com/articles/read/573/how-to-...

Answer 2

It is forbidden. Especially in Java or C#.

Answer 3

On Windows, you can do this:
https://docs.microsoft.com/en-us/archive/blogs/tou...