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Microsoft Research Detours Package
Detours is a software package for monitoring and instrumenting API calls on Windows. It is distributed in source code form.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
That's how things like steam or Nvidia overlays work, or fraps or OBS hook the output buffer; you can use official packages published by Microsoft for that, such as Detours.
NOTE:
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