How to Map Keyboard Control Keys

Hi,

I just installed a new Flirc USB IR receiver on a new HTPC running Windows 11. It will replace an older less powerful HTPC. The old system had IR built in, but I built the new one and have to add the IR functionality. I use a great programmable remote that most of you probably never heard of, but it can transmit codes for all the keys on a Windows MCE IR keyboard. I use  a lot of them, so need the Flirc to handle that. I was hoping I would be OK with the apparently built-in Microsoft WMC Profile, but that doesn't seem to be the case. I actually have one of the old Microsoft Windows MCE IR keyboards that works perfectly. So, I am trying to use that to map all its keys on the Flirc. It is mostly working just fine. I have mapped most of the keys already. Now, this seems like it should be really a dumb question, but I cannot see how to map the keyboard shift type keys. For instance, How do I map the left and right shift, ctrl, alt and Windows keys? When I bring up the full keyboard in the Flirc app and select, for instance, the shift key. the app waits for me to press another key to see what pairing of the shift key I want to map. I have been searching for a while and decided to save some time and just ask. How do I map the shift key itself. None of those keys map properly automatically.

I really appreciate your help with this.