Multiple CPUs

[Nicholas Bernstein]

How can one detect if a system is using multiple CPUs? 
I'm running freebsd 4.9 and I was hoping that either uname or top would
give some information as to whether or not the second cpu is being used.
dmegs outputs the following:

	CPU: Intel(R) Xeon(TM) CPU 2.40GHz (2399.33-MHz 686-class CPU)

but I want to make sure that this is not just showing it's been
detected, as opposed to being used. 

-- 
Nicholas Bernstein, Unix Systems Administrator
Document Systems Inc.
http://docmagic.com
nick at docmagic.com