I believe you are referring to x64 bits mode.
If that is the case, then this processor supports x64 bits, which means that you can run 64 bits operating systems and 64 bits applications on your system.
If this http://en.wikipedia.org/wiki/Long_mode means x64 bits mode then it is great I just don't figure out what is written under that link... Some software require x64 long mode, and this is a real term. So I am wondering if my processor supports it.