Blender 2.48a and AMD 64 X2 - how to use both cores?

How do I engage both cores on my AMD 64 X2 (under Vista 32bit) with Blender 2.48a ?
Do I need to compile Blender on that PC with special parameter or does vanilla 2.48a will use both cores?
Thank you.

If you’re referring to the rendering process, Blender will automatically detect and use all available cores.

Most of blender is single threaded, so cannot use multiple cores/prosessers. as stated above, the render is multi threaded.