Assign a database security role to a Windows security group
EXEC sp_grantlogin 'BUILTIN\Administrators'
EXEC sp_addsrvrolemember 'BUILTIN\Administrators','sysadmin'List the members of a database server group
EXEC master..xp_logininfo
@acctname = 'Builtin\Administrators',
@option = 'members' -- show group members