Your first obstacle is that windows that are not "Active" (in the Foreground) will not accept keystrokes until they are made active. That is, using Keyclone will not work the way you expect it (or at all).

HKN can get around this by first broadcasting the keystroke to each instance, and then activating each instance to allow the keystroke to be processed. However, this means very poor game performance and response time. You will likely end up wanting to bang your head against a wall several minutes into your playtime.

Technically, Innerspace could remedy this using the "Lock Foreground" feature, but Innerspace essentially places a layer between the game and the rest of your system, and thus is easily detected by anti-cheat software.

There are a few who multibox using hardware solutions (1 computer per instances of WAR).

And no, HKN and Keyclone are not considered Automation tools.

Good Luck