Swapping the Fn and Ctrl Keys on a Lenovo ThinkPad Keyboard
Solution 1:
Lenovo laptops (2008 models and newer) have a setting in the BIOS to switch these two keys.
There is no other way to do it except in the BIOS, because the Fn key is intercepted in hardware (only in combination with other keys), and never shows up in the operating system.
If you are not using the keyboard with a Lenovo branded system, you may not be able to do it at all.