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UNIX is a multiuser, multitasking operating system. This
means that it supports more than one user at a time, and can
have more than one task, or job, running at one time. Each
task gets a certain percentage of CPU time, delegated by the
kernel. UNIX systems are preemptively multitasking, which
means that the operating system is in control of when a task
will get CPU time, allowing all the tasks to be running
simultaneously, each taking turns.
Most UNIX systems were designed to be in a networked
environment. The ability to log in or access your files
remotely is an integral part of the system. This goes to an
even higher level in the Glue or the WAM machines,
for example, where there are several different machines
sharing resources and a common list of users. No matter which
machine you log in to (with some exceptions), you have access
to the disk with your home directory, and many other common
resources.
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