Standard Cron Tab Setup

[sexshun]

Is there an explanation of the standard cron tab setup for webhost manager.

I currently have these on my root crontab that I don't understand. Please Read the comments i put // (here)

/usr/local/cpanel/whostmgr/bin/dnsqueue > /dev/null 2>&1 // (Every 15 Min) Dumps the DNS Queue....I'm not sure why, i thought bind would have its own queue management.
/usr/local/bandmin/bandmin // i know what bandmin is, but why does it run at 2 and 58 minutes
/usr/local/bandmin/ipaddrmap // (Runs Daily) No idea
/scripts/exim_tidydb > /dev/null 2>&1 // (6:00) In the manual it apparantly cleans up my exim message logs but I don't know exactly how it cleans it...truncates to a certain date?
cd /usr/local/cpanel/whostmgr/docroot/cgi/fantastico/scripts/ ; /usr/local/cpanel/3rdparty/bin/php cron.php > /dev/null 2>&1 // (Runs Daily) Fantastico update maybe?
/usr/local/cpanel/bin/dcpumon >/dev/null 2>&1 // (Every 5 minutes) no idea

Anyone want to give me some clarification please.