General purpose operating system is never time bound.no time limit is specified for completing a process.But real time systems, a time limit is specified for each process to finish.Real systems are of 2 types:soft time real systems and hard time real systems.In soft time real systems,if the process is completed in specified time the the process is accepted and if it is not,then the quality of the process is degraded.In hard time real systems, if the process is completed in the specified time limit, then it is accepted and if not, then the process is simply discarded.