Oracle upgrade from 10.2.0.2.0 to 10.2.0.4

Dear Gurus,

I need to upgrade oracle from 10.2.0.2.0 to 10.2.0.4.

System Details : Win NT/64bit/Oracle 10.2.0.2.0

Please let me know which are the steps to be followed. It would be great if you can provide some pdfs or link to SMP.

Regards

Paul