CPUCool display's the temperatures, fan speed, voltages, system values (Data input and output) and SDRAM's contents, cooling for Windows and change the frequency of your PC.
The only difference between the shareware and the registrable version is that you can save the settings in the registrable version and you will not see the shareware reminders any longer. The registrable version is at a secret link. You can download it yourself from there. The link may be stable for some versions if there is no registrable version in the internet.