His company advertised DOS and XENIX together, listing the shared features of its “single-user OS” and “the multi-user, multi-tasking, UNIX-derived operating system”, and promising easy porting between them.

Which operating system is single user?

Single-User/Single-Tasking OS

An operating system that allows a single user to perform only one task at a time is called a Single-User Single-Tasking Operating System. Functions like printing a document, downloading images, etc., can be performed only one at a time. Examples include MS-DOS, Palm OS, etc.

Is UNIX a single user operating system?

UNIX is a multi-user operating system: that is a suite of programs which run a computer and allows interface to the hardware and software available. … Because multiple users share the same resources under UNIX, the actions of one user can very easily impact other users of that machine.