Opencv-ocl excutable with different hardwares?

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I am working on opencv-OCL library. I use AMD Radeon™ HD 7400M Series GPU. I need few clarifications on it.

1) I downloaded the AMD SDK and built opencv with opencl enbled and made a basic c++ executable for face detect.

In this case, How my exe behaves in the following scenarios:

a. When it runs on 'OpenCL supported Intel or NVIDIA GPU' based computers?

b. When it runs in a Computer without OpenCL supported GPU's?

2) Do I need to make different opencv-ocl exe's for different hardwares?