How to Install PS/2 Hardware Keylogger on PC and MAC

http://www.keydemon.com/
The most advanced PS/2 hardware key logger available on the market, with up to 2 Gigabytes of internal flash memory! This hardware keylogger features a text menu with loads of options for analyzing recorded data. Additionally, the USB Download Accelerator is included for super-fast retrieving of logged data. The keystroke logger is completely transparent to computer operation, no software or drivers are required. Supports national keyboard layouts.