The operation evaluates classes in a source classified data by a given macro. The procedure is the following:
For each class 
in <cldatain>
Copy to a temporary class <class>
Run: runcmd <macro> <class>
Delete <class>
End
One parameter, the name of the temporary class, is passed to the <macro>. Another important point to note is that the output class is deleted after the macro has been executed for a data record. See more about running command files in Section 8.4.