Producing a string in a trail file

I'm generating sections of trail files and want to insert a string that can be recognized after the trail file has been processed through Wildfire 5 and Creo.

Is there a dummy command that can be used that the trail file processor will duplicate on output? Comments originating in the input trail file are removed from the output trail file, so I can't just insert comments in the input trail file. I suspect I can use an existing command that has no effect on the trail file, but it seems like there might be a more standard way of doing this. I need more detail than a simple marker so trying to flag an action with something like ProCmdUtilTime won't work...

Thanks,
Mark