You'd need BIOS options to do that.  The reason is that the Fn key is only received by the system firmware, so for example on the 7490 when you press Fn+Left Arrow, only the system firmware receives that signal, and it then generates a "Home" key signal that gets sent to the OS.  The OS doesn't actually see "Fn+Left Arrow", which means you can't use the OS to customize key presses involving the Fn key, unless the system vendor has some configuration application that runs in the OS and updates the system firmware configuration to achieve this.

Thanks.

I have gone to F2 while rebooting to get into BIOS setup, however I don't see anywhere where I can customise fn keys. Is it available with Latitude 5400?

thanks

 Gu

@Bluetoba  if you don't see it, then it's not available.  But in fairness, I've never seen the type of customization you're requesting offered on any PC.  The closest thing I've seen is that Lenovo ThinkPad systems have an option to swap the function of the Fn and Left Ctrl keys.  The reason they offer that is because ThinkPad systems have those keys arranged backwards relative to the rest of the industry, including Lenovo's own IdeaPad line, so that option helps people who are accustomed to other PCs migrate to ThinkPads.  But I've never seen an option to define custom key mappings involving the Fn key that produce a specific key output.

hmm... Okay fair-enough. 

It's just annoying that it is the closest on your fingers without having to look at the keyboard if you want to go to the end of line or beginning of line.

"But in fairness, I've never seen the type of customization you're requesting offered on any PC"

I am sorry to report to you that my DELL XPS 15 and my INSPIRON 13 has it by default. You can check their keyboard layout online if you don't believe me.

I don't want to make you look bad but I too would like to configure it on the corporation's LATITUDE 5510.