Workgroup PDM over WAN?

We are looking at using Workgroup PDM but I have been getting mixed answers from our VAR on whether we can use it over the WAN or not. I have not been able to find anything in the help files that say it only works over the LAN or can work over the WAN so any definitive info on this would be great. There would be 4 to 5 users working at the home offices where the server is hosted and one user working at a sister site over the WAN. Other than the speed of the WAN vs. the speed of LAN can this setup work?

Thanks

SolidworksWorkgroup Pdm