Solved: What key to use as Fn on a non-Lenovo keyboard?

[RealBlackStuff]

Recently I acquired a Lenovo M900 Tiny to replace my (compared to that: monstrous!) desktop.
To give you an idea of its size:

My own desktop is actually taller than the Desktop above!

It didn't come with a Lenovo keyboard, so I am using my TKL (ten-key-less) external keyboard.
Does anyone know how to get the Fn function on a non-Lenovo keyboard?

Never mind: there was an Fn key next to AltGr key on the right side of the Spacebar. I just never looked there, duh...

[Jake.Werecat]

Hmm, I've never had a Fn key on an external keyboard ever, not even on Lenovo ones. Why would you need such key for a desktop?