Introduction One of the features of Microsoft Windows is performance counters. A performance counter is just an integer managed by Windows; it can be added to, subtracted from, and have its value set. Windows comes with many of these to count things like disk I/Os performed. You can read these, but not change them. You can also create custom performance counters, which can be both read and changed. Custom performance counters can be used to instrument applications, e. g., number of order received,...