Yeah, it does that. To install the driver without an AMD GPU you need to run the installer so that it extracts the temporary files and then manually navigate to (default)
C:\ATI\SUPPORT\streamsdk_2-0-0_win764\Packages\Apps\ATIStreamSDK_Dev_win764a (that’s for windows 7 x64 but you can’t miss it)
There you will run the msi which installs their OpenCL toolkit complete with their OpenCL.dll
You’ll also find the samples nearby, install them as well (optional, as with Nv’s SDK). It’s best to install both to the same directory which is not the default setting so pay attention.
Developing cross-compatible code is possible. By default your app will find NVIDIA’s implementation because it sits deeper in the system. To use AMD’s implementation, copy their OpenCL.dll to the executable’s folder so it finds it before searching in the system directories.