Fair queuing is a family of scheduling algorithms used in some process and network schedulers. Various charts are used to help schedulers visually manage schedules and constraints. The first desktop applications were intended mainly for project managers and project schedulers. Tidal Workload Automation is one of the oldest enterprise batch schedulers still in active production. API access to allow for integration with existing dashboards or schedulers. Most real-time operating systems (RTOSs) have preemptive schedulers. New directions for designing effective DVFS schedulers for heterogeneous systems are also being explored. Many operating system schedulers employ the concept of process priority. Some, but not all supercomputer schedulers attempt to maintain locality of job execution. Round-robin (RR) is one of the algorithms employed by process and network schedulers in computing. The change also caused problems for college registrars, schedulers, and calendar makers. All practical schedulers approximate GPS and use it as a reference to measure fairness. This is not to be confused with other schedulers, in hardware or software. IBM OS/360 was available with three different schedulers. The programme was Aherne's first critical failure, which Harries blamed on the BBC One schedulers.