Thanks for the information on Showkey Hendrik.
Do you know of any Windows software we can use to confirm that an IR command is being received, and would be seen by MC in the learning function? It has been on my ToDo list for some time to try to work out what is going on with non-MCE IR commands on MC, but I haven't gotten to it yet. The only way I know to move forward is to shut down MC and run another App that would see the commands, and perhaps deduce something from that.
I'll have to look up my IR Receiver's Device ID later, but it is an Inteset receiver designed for use with MCE remotes and WMC. It should be receiving all commands I send to it from my Harmony remote, including Extended MCE commands, many of which are key combinations, but I don't know what it does with them. i.e. Whether it converts them to a keystroke.
BTW, if an IR Receiver converts received commands to a keystroke, that would be just fine. I could then set up the appropriate keyboard shortcut in resource.xml and link them to the commands I want to use. The problem until now has been that the IR Command just disappears.
Of course many apps exposed the underlying IR Code being received, and it is mostly good that MC hides that from users. But it makes fixing IR, and confirming what is happening, almost impossible.