Helper processes in 3.2

Hi! I just wonder why "disker" and "coordinator" Squid kids are spawning
helper processes, while I don't see any reason for them to do this. For
example, if I have

---------------
workers 2
cache_dir rock /var/spool/squid 4049 max-size=32768

url_rewrite_program /usr/bin/squidGuard -c /etc/squid/squidGuard.conf
url_rewrite_children 8 startup=1 idle=2 concurrency=0
url_rewrite_bypass on
---------------

in config, it will end up with four squidGuard initial processes (1 for
kid-1, 1 for kid-2, 1 for disker and 1 for coord). But I'm not sure that
disker and coordinator need squidGuard.

Can somebody shed a light on this?

-- 
Best wishes,
Alexander Komyagin