It's a keyboard that uses a ps2 connection instead of usb. It will allow you to enter your bios setup program if your system cannot do it using a usb keyboard. Pic here.
Even if your computer is newer, it still most likely has the available connections (1 mouse, 1 keyboard) on the back of the system. Nothing special need be done. Just power off, disconnect your usb keyboard, connect the ps2 keyboard and power back up.
BTW, make sure you plug it in the keyboard port and not the mouse port. Should be labeled back there.
Edited by HitSquad, 01 May 2009 - 01:10 PM.