How can I use Cuda Visual Profiler Tell me How i use Cuda Visual Profiler

I wrote a Cuda program and want to run in f Cuda Visual Profiler.But I am unable to do so.I have Following queries:-
1.Where could I learn Cuda Visual Profiler.
2.What is extension of its file.
3.What is it use.
4.How i run my program in it.
Thanking you

Documentation is online http://www.nvidia.com/object/cuda_develop.html and in “Help” of profiler.
The profiler is “cudaprof.exe”.
Also you may check http://www.nvidia.com/object/cuda_get.html in section “CUDA 2.1 Other CUDA resources”.