If you look at the fourth picture in my last post ... It shows the second PC receiving the commands for both itself and the third PC
Ah, okay, that's all I needed to see. That picture shows PC 2 receiving <sendpc> for the other PC. That shouldn't happen. Can you please email me the hotkey file with the definition that results in that picture? I need to see the actual file because this probably has something to do with the binary contents of the file. Thanks.

Also, what program did you use to edit and save the hotkey file?