Is there a way to lock keyboard to one game window?

[Mbnewbtbc]

Is there a way to lock keyboard to one game window? I will be clicking the other game
window but I do not want my keyboard to send any clicks to that windows and I would
Like to be able to continue the rotation while click healing.

[nodoze]

For anyone interested in this topic this please be aware that it is also being discussed, at least from a wow perspective, in this thread:

https://www.dual-boxing.com/threads/58319-Dualboxing-with-a-Controller?p=434504&viewfull=1#post434504

That is the only possible solution path that I know of so far and is specific to WoW.

Would love to know of a solution to bind a controller/mouse/keyboard/keypad/keystick to a given windows window (any window or any game window) as that could really help limit overhead from extra PCs/VMs/Multiseat-Desktops/etc...