I use it as the Mouse key. I consider the key that is usually CapsLock (Mouse on the UHK) to be Control, which I guess dates me to the Sun keyboads. The beauty

I use it as the Mouse key. I consider the key that is usually CapsLock (Mouse on the UHK) to be Control, which I guess dates me to the Sun keyboads. The beauty of the UHK is that everyone can set it up to his/her own preferences!