General performance data is held in the volatile registry hive HKEY_PERFORMANCE_DATA, which I suggest you google for more info.
There are quite a few network monitors available, like MRTG for example.

In reply to Re: Detect if Windows screensaver is running or screen is locked (Lock Computer) by cdarke
in thread Detect if Windows screensaver is running or screen is locked (Lock Computer) by nicc777

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