ASPL Interrogation Operators

The ? is ASPL interrogation operator. By interrogating a set variable, ASPL will redo the processing of the set variable using its original processing source to determine if there is a change in the resylting data set. In which case, if a change is detected then ASPL will archive the variable then update it with the new data set. It is also possible to interrogate COS variables with the ?c operator.
In addition, the ?? forces to interrogate the source of the dataset by walking down the dependencies of the variables.

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