You can easily connect to the serial port on your friend’s PC who is miles away over the internet by using this software.

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You can check temperature of various components of your laptop or Desktop using this ,

HWMonitor reads all the main health sensors present in your PC. Its a complete solution that displays your voltage levels, fan speeds, CPU temperature, hard disk temperature and graphics card temperature

also, shows min and max temperatures . nice utility

Download HWMonitor (963KB)
Official Website
Platforms Supported : Windows Xp/Vista/7
License : Freeware