What is meant by multiuser?

Answer

Multi-user operating systems allow multiple users to utilize the computer and run programs at the same time. All time-sharing systems are multi-user systems, but most batch processing systems for mainframes are too, to avoid leaving the CPU idle while it waits for I/O operations to complete.

The most obvious example is a Unix server where multiple remote users have access (via Telnet or Ssh) to the Unix shell prompt at the same time. Another example uses multiple X sessions spread across multiple monitors powered by a single machine.

The opposite term, single-user, is most commonly used when talking about an operating system being useable only by one person at a time, or in reference to a single-user software license agreement.

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