How to send ctrl-break?

I need to send a ctrl-break to interrupt a SAS job.

By default pause/break is mapped to option-F3.  When I push option-F3 
the cursor flickers in Windows, so I assume the combination is getting 
through.  When I add ctrl to the mix nothing happens--so maybe RDC or OS 
X is eating the combination.

I've tried assigning pause/break to command-. instead, but the same 
thing happens.

How do I send ctrl-break using RDC?

Thanks.