There is basically no difference. Either the OS supports more than 1 user or it doesn't. Windows 7 for example supports single or multi users. Other Windows 7 tips and tricks available at: http://www.waltwachon.weebly.com
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Embedded operating systems cannot be replaced with other operating systems. embedded system are designed for dedicated applicationembedded system are tailored to specific application.
A single user OS could also be a real-time system. The differences in the two are based on how a process is given control or priority within the system. Realtime systems give preferences to realtime control processes (realtime runs at a much higher priority level). Most single-user operating systems treat processes with equal priority unless you indicate that a certain process is to receive preferential treatment. This can be done by raising the priority of the user process to that of realtime, meaning it will receive resources (such as CPU cycles) above other programs in the system.
A single program operating system allows only one program to run at a time.
An example of Single task, single user Operating system is Palm OS for palm handheld computers.
multiprogramming-there is no way for single user to keep either cpu or the io divices busy at all times...