I have a fairly simple sample which works perfect on my NVIDIA 8800 GT, however I am kind of wondering why the following piece of code only allows me pick one platform (the NV8800 GT)

Code :
cl_int status = CL_SUCCESS;
cl_uint numPlatforms;
status |= clGetPlatformIDs (0, NULL, &numPlatforms);

I have an Intel QuadCore2 (Q6600); Isnt there some way where I can get my code to run on the CPU ?