I was wondering if anyone would be able to explain exactly what setting to "Use VPN" option does against each of the subnets I have available within our MX appliance:

When I select "Yes" under the "Use VPN" field, the subnet then appears under the VPN Status page under "Exported subnets":

What does exporting these subnets actually do? Does it just present that subnet to all defined VPNs so traffic is routable between the subnet and remote networks at the end of the VPN? I can't seem find a proper explanation for what it actually does.