The VPN is intended for integration purposes. When processes need to reach systems, servers, services, or databases that are not exposed via the internet, the VPN is a secure way to access those systems. This modem is perfect for laptop/notebook users and allows them to be connected whereever they go. Be aware that some companies offer better coverage than others and you should inquire as to the range of the modem prior to purchase to make sure you will not be disappointed in the speed and the areas that you can use the service.
Your ISP or computer service provider may be able to assist you in looking at the various wireless options and help you to source the necessary equipment. Infra-red links is a preferred method because it does not require any frequency license and is less prone to interference from adjacent links.