OOF2: The Manual

Output.  This is the quantity that's being operated on, for example, a Field component or strain. It's specified by the data argument to the Analyze menu command. Outputs are defined in Section 6.3.

Operation.  The Operation is what happens to the Output. It can be printed directly to the screen or to a file, or it can be subjected to various statistical operations. The operation is determined by the particular command in the Analyze menu.

Domain.  The Domain determines to what part of the Mesh the Operation will be applied. It's set by the domain parameter of the Analyze menu command.

Sample Set.  The SampleSet determines how the data is evaluated within the domain. It's set by the sampling argument of the Analyze menu command. Not all SampleSet methods make sense for all Domains and Operations.

Destination.  The OutputDestination determines where the output goes — to a file, the Message Window, or a Graphics Window. Different kinds of Operation require different kinds of Destinations.