The OpenMP standard allows programmers to develop threaded parallel applications on shared-memory computers, such as on a node of the Frontera or Stampede2 supercomputers at the University of Texas at Austin's Texas Advanced Computing Center (TACC). OpenMP is an API specification for parallel programming, and implementations always trail the specification. Many of the newest features of the OpenMP specification are not widely available, so this topic focuses on the widely available features from versions 3.0 and earlier. It provides a high-level overview of how to use OpenMP to write programs that use multiple cores on a node for concurrent computation.