SQL2000 - sp_who vs master.dbo.sysprocesses

I am using SSMS2008 connecting to a SQL2000 db instance.

Trying to find a test account, that "ran away" during an app test. I was going to kill the processes.

If I issued SP_WHO, I have a list of 90++ of that username. However when I issued

SELECT spid, login_time, status, hostname, program_name,
nt_domain,nt_username, loginame
FROM master.dbo.sysprocesses
WHERE loginame LIKE '%test%'

I do not see the 90++ ran away usernames.

Why is that?