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An Real-Time Operation System or RTOS is simple multitasking operating system. The advantages include faster response and more modulare code design.

There are two main implementations of a RTOS, cooperative and preemptive. A cooperative system uses a timer loop to switch between tasks when they are completed. This provides a good approximation of multitasking while being very light and easy to implement. A preemptive system usues interrupts to switch tasks. This is true nultitasking, but involves a lot of work and is more resourse intensive.

Below is the link to DuinOS and FreeRTOS, both things to look into in the future.

DuinOS

http://multiplo.org/duinos/wiki/index.php?title=Main_Page

FreeRTOS

http://www.freertos.org/