The Host System

As previously mentioned, each connection involves a local and remote computer and the distance between these systems may be measured in inches or miles. Generally, the remote system is called the host or server. Its responsibility is to "serve" the requests of the local system which involves a variety of tasks. Minimally, the host needs to serve the file transfer needs of a local system. All transfer software performs this important function. But what if you want more out of your host? With the right software, you can turn your host system into a communications server.

For example, assume that in your office you have 10 PCs connected to your IBM RS6000 and each PC user needs access to a modem on a part-time basis. Your options include: 1) install 10 modems and 10 phone lines for each PC (expensive); or, 2) install a PC network with a modem server (more expensive); or, 3) install three modems and three phones lines for the host system (less expensive). With the right host software, each PC user can access a modem when needed.

Or assume that you maintain a TCP/IP network of SCO UNIX and Sun Solaris computers. Your sales and engineering staffs telecommute and need access to any network node. A host system can provide a central connecting point for that access.

Powerful host software can control your file transfer needs. If your transfer needs vary, modifying a single host instead of 50 local systems saves time and money. The local system initiates the connection and the host system decides which files should be transferred.