This section describes sequences to compare the data sets of two different instances using the IDtmDiagnosis interface.
The two DTMs invoked in the comparison have to be of the same type.
What does the FDT Group mean by "DTMs" and "type" here.
Two different DTMs would mean that they have a different ProgID. In this case, they could even be of a different vendor. What should one vendor compare to another vendor? Hopefully, no frame application developer would have had this idea.
But even the DTM is of the same type in the meaning of COM object, they cannot be compared: they must be have the same device type as well.