Does anybody recall how to get an OFA-type remote to send a specific extended function code without atctually programming it into the remote?

In other words, lets say I have a brand new TV device programmed into a device key, but I want to experiment to find extended functions that are not listed in One-For-All's extended function list for that TV. If I want to test extended key value 124, I believe there is a key sequence to make it send a test burst of code 124. But it has been a while and I forgot the trick...

Bob