Yep, I had ran some tests to double check. When I disconnect my lap top from the network, it can not find the needed fonts.
It should be possible though (I'll need to double check at work tomarrow as to how we had handled this in the past) to have the application check in a series of priorities for the font locations. The fonts themselves do not need to be "installed" in order to be accessed via software. It should be possible to force 3DGS to look in the root folder of the application for the font if it does not exist on the computer already (or check the root folder first - which might be a better solution to avoid naming conflicts of custom fonts).