For these facilities, there is a direct connection between the computer that the user is using, and the Internet. This is true if the user is using a PC, or a dumb terminal connected to a UNIX server. Because of this, you will need to subscribe arrange for a Network connection to your Internet provider which is more expensive that the basic Host connection. The cost will vary from provider to provider, but will be approximately 10 times the cost of a basic connection. The appropriate type of high speed link will depend on the number of concurrent users, and the type of services that they will be using.
Security is another consideration.
Making direct connections from your network advertises your site to the world, making it a possible target for unauthorised access. To make your network secure you will require some type of firewall. Basic firewall protection can be provided by a masking router, which only lets the types of traffic that you specify transfer between your network and the Internet. Proxy servers can be used to completely separate your network from the Internet, and to hide your Internal network. For the most security conscious sites, a full firewall server is required.