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.