What is difference between 'Cores across processors' and 'Number of CPUs'?

For Example: Consider following is processor configuration of my machine:
Intel(R) Core(TM)i5 CPU 650 @3.20GHz (4 CPUs)
Then how should i find out how many 'Cores across processors' My machine have?
Is it the 4 cores[i.e. Number of CPU]?

I have referred following links but still i does not get clear idea:
http://www.ehow.com/how_6873203_do-number-core-processors-windows_.html

Can anyone please clear my doubt?