Anyone know of using kvm (keyboard, video, mouse) or other software/hardware that can control 2 computers or more at once without switching between computers?

What I'm looking for is 2 PC, 2 monitor using 1 keyboard and mouse.

If I type "hello world" in wordpad, it would type on 2 PC at the same time; not type it on one PC then retype the same thing on another PC.

Know of such thing exist?

OK so no such thing exist as of todate... after 19 views...

A KVM isn't designed for this.
What it allows you to do is access multiple computers using 1 set of Keyboard/Video/Mouse.

I have to ask what are you trying to achieve ?
Surely not just entering data on two sets of notepad at the same time, there must be more to this.
The more information you give us the better we are able to help.