When I started building Unviewable, I needed one thing: a window that's invisible to all screen recorders.

The answer was in the Windows API: SetWindowDisplayAffinity()

This post covers:

1. How WDA_EXCLUDEFROMCAPTURE works under the hood
2. Why DXGI-based recorders can't see it
3. WASAPI loopback for audio capture
4. Edge cases that took weeks to solve