$WBRENDER is available for use with all WBSP commands:
anystring - any string containing WhizBase tag(s) and function(s).
The rendered value of anystring. This means that WhizBase will process any tag and/or function contained in anystring before it sends it to the client
If we assume that there is another table in the database that contains different WhizBase and HTML code for the body of the report for every user then getrep.sr subreport should return a WhizBase code for displaying the contents of the "titles" table in "biblioA.mdb" database. So, calling subreport alone will return unprocessed WhizBase code, but using $WBRF in subreport will produce the error (Item not found in this collection). So, subreport MUST NOT process the code, but return it to the main report. There we use $WBRENDER to instruct the WhizBase to process the code in main report. This is just one of many possible usages of $WBRENDER function.