Step 1: select d.name, d.dbid, spid, login_time, nt_domain,
nt_username, loginame
from sysprocesses p inner
join sysdatabases
d on p.dbid = d.dbid
where d.name = 'DBName'
go
Step 2: kill 122--(SpId)--spid
Step 3:ALTER DATABASE DBName
SET MULTI_USER