Web browser, vision client internet access

Our plants have two networks. The office network has internet access. The other network is for PLC, HMIs, etc and does not. The Ignition gateways have two network cards and is on both. Most of our Vision clients run on the network without internet access. If I run a client with a web browser component, does the client computer need direct internet access or can it access an internet address using the connection the gateway has via the other network? I would just test this out but I am currently working from a remote site.

It needs direct internet access. The Ignition gateway does not act as a proxy.