Some
of us are old enough to remember entering data on dumb terminals
connected to a mainframe computer. The terminal consisted of
keyboard and monitor. The mainframe did all the data crunching,
and served results to the appropriate monitor. The advent of the
personal computer definitely changed all that - we now have a
mini-mainframe right under the desk. Only now, our mini-mainframe
is a one-user box.In
terms of hardware resources and software, we probably use less than 10%
of the capability of our personal computers. We pay for
availability. Why not move the hardware and software resources
back to a mainframe stand-in, and pay a fraction of the cost for the
same availability? Our mainframe stand-in is known as a
terminal server. The terminal server looks a lot like our
personal computer, except the operating system is Windows 2000 Server,
or Windows 2003 Server. The OS is a little pricier than what we
had on our personal computer, but now we are sharing the OS and hardware
resources (and cost) among several users networked to the terminal
server. When we add expensive applications like AutoCAD®,
we cut the cost per user by time-sharing the application. Instead
of using a personal computer, we connect to the software and hardware
resources using a Thin Client.
So
where does the "thin" part come in to play? Our computing power is
"thin" because we have eliminated much of the hardware and software on
our desktop. All we need is a monitor, keyboard, mouse, and small
appliance to network to the terminal server. The appliance, known
as a thin client, contains no hard drives. In fact, it may
contain no drives at all, making it no bigger than a thick paper-back
book. The Thin Client appliance generally has a serial port,
printer port, USB ports, and audio out. CD and DVD drives can be
connected to the USB ports.
Personal
Computers can also be "thin" in terms of the software they run. It
is economically prudent to share expensive applications among many
users, running the application on a terminal server. If users run
the application concurrently, more than one license will be necessary.
But statistically the number of licenses will only be a fraction of the
number of users, since we don't all do the same thing at the same time.
A browser, such as Internet Explorer is the only software required by
the personal computer to open a session hosted by a terminal server.
Thin
Computing is catching on in companies requiring tens to thousands of
terminals. PCs require ongoing hardware and software maintenance,
not to mention replacement every few years. In a Thin Computing
environment, total cost of ownership is drastically reduced. But
Thin Computing is also economical for small businesses and SOHOs that
are networked to application servers, such as over high-speed Internet.
Personal computers, as well as Thin Clients, can access
shared applications on terminal servers.
