1, The full form of RTOS is Real-Time Operating System. It’s used on Computing ,Sofware & Applications in Worldwide

A Real Time Operating System, commonly known as an RTOS, is a software component that rapidly switches between tasks, giving the impression that multiple programs are being executed at the same time on a single processing core.

In actual fact the processing core can only execute one program at any one time, and what the RTOS is actually doing is rapidly switching between individual programming threads (or Tasks) to give the impression that multiple programs are executing simultaneously.

The difference between an OS (Operating System) such as Windows or Unix and an RTOS (Real Time Operating System) found in embedded systems, is the response time to external events. OS’s typically provide a non-deterministic, soft real time response, where there are no guarantees as to when each task will complete, but they will try to stay responsive to the user. An RTOS differs in that it typically provides a hard real time response, providing a fast, highly deterministic reaction to external events. The difference between the two can be highlighted through examples – compare, for example, the editing of a document on a PC to the operation of a precision motor control.

2, The full form of RTOS is Rochester Theater Organ Society. It’s used on Associations & Organizations ,Regional Organizations in United States

Rochester Theater Organ Society (RTOS) an organization to preserve theater pipe organs for the residents of Rochester and the surrounding areas in upstate New York.

The Rochester Theater Organ Society (RTOS) was formed in 1964 to preserve theater pipe organs for the residents of Rochester and the surrounding areas in upstate New York. RTOS is an independent organization incorporated by the state of New York as a not-for-profit educational institution.

The Society maintains two examples of the Wurlitzer theater organ.  See sub-menu under the About Us main item for details of these instruments.