Andrew Russell:

I think I have a solution. You originally assumed that you had to use a temporary key to do the swap. However, as we have found out, when a key that has a moved/advanced code assigned to it, the key mover function grabs the original function. Therefore, all you need to do is:

MAGIC**,9,9,4,'DISPLAY','PREV CH'**
then
MAGIC**,9,9,4,'PREV CH','DISPLAY'**

That should work.

Cico:
You said, "Remember that you can also copy the EFC
(advanced code) of one device to another device set by moving (EFC programmed) keys between devices."

What? You mean the key mover WILL move an advanced code or copied button from one device to another? How?