parallel branch(An element of workflow logic that defines an alternative wait condition with a corresponding set of additional steps that are only performed when the initial criterion is met)
side-by-side execution(The ability to install and use multiple versions of an assembly in isolation at the same time. Side-by-side execution can apply to applications and components as well as to the .NET Framework. Allowing assemblies to coexist and to execute simultaneously on the same computer is essential to support robust versioning in the common language runtime)
parallel execution(The apparently simultaneous execution of two or more routines or programs. Concurrent execution can be accomplished on a single process or by using time-sharing techniques, such as dividing programs into different tasks or threads of execution, or by using multiple processors)