1. Not 100% all, but most, yes. As long as the camera provides a video stream with a standard protocol (not some proprietary, cloud-only nonsense),
Blue Iris can probably access it.
2. Maybe? None of those terms point me at a distinct product.
If you haven't bought a camera yet, then forget that DSC security ever existed and get something Dahua branded. And also forget about using wifi. Only the very lucky use wifi cameras without endless connectivity problems.