>Is there a way to tell within the report if the report is being run with the SUMMARY clause which suppresses printing of detail bands?
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>I've searched and searched but I only find information relating to the summary band of a report which is not what I'm looking for.

Any local variable from the code method/event where you use REPORT FORM... SUMMARY command is visible for report, so you may have a variable, e.g. lSummaryflag and set it .T. if your code calls REPORT FORM with 'summary' and leave it .F. if code calls REPORT FORM without 'summary'.