we have split SimTools into GameManager on the GamePC and GameEngine on the other PC controlling the actuators.
Read more here:
http://www.xsimulator.net/community/threads/how-to-set-up-a-dual-pc-installation-of-simtools.4974/
Nota: you have to install plugins on both computers!

Here a single computer setup:
Here a dual computer setup:
And remember the tcp/ip configuration, for best performance (and in old computer for best startup) to config 2 pc's in static IP non in DHCP!
Example:
PC - 1
- Go to My Computer > Properties > Computer Name.
- Change the computer name to "A" and workgroup name to "Simulator", and click OK to save changes.
- Go to Control Panel > Network Connections.
- Right click on your LAN connection and select Properties.
- Select Internet Protocol (TCP/IP) > Properties.
- Enter these values:
- IP Address - 192.168.0.1
- Subnet Mask - 255.255.255.0
- Leave the other fields blank and click OK to save changes.
PC - 2
- Go to My Computer > Properties > Computer Name.
- Change the computer name to "B" and workgroup name to "Simulator", and click OK to save changes.
- Go to Control Panel > Network Connections.
- Right click on your LAN connection and select Properties.
- Select Internet Protocol (TCP/IP) > Properties.
- Enter these values:
IP Address - 192.168.0.2
Subnet Mask - 255.255.255.0
- Leave the other fields blank and click OK to save changes.