The VxWorks is the high performance real time operating system. Most widely used RTOS is the VxWorks. The operating system, which performs the proceeding in the real time instead of latter time with storing it in some memory. Development environment for this OS is Tornado, Wind River Systems Inc, US. This is scalable Operating system in which kernel, I/O system, network layer and all are in component nature and which are being used whenever required to add to Kernel. Modularity of this feature is one of the main advantage in development of real time applications.