Use all 6 processor cores?

I have a PC with Windows 7 and an Intel core i7 processor. Does Blender automatically detect and make use of all six cores (such as when rendering), or is there some setting that I should adjust to take advantage of the processing power of my computer?

Set number of threads to use in rendering in the Render / Performance panel. By default it is set to use all threads. Note that some simulations are single threaded

Blender should use all cores/threads of your CPU automatically during render process.
Check with BMW27 benchmark, user with 6 core >

BMW27 .blend on first page.

Cheers, mib