Another Strange Process mDNSResponderHEL

Here's a tough one - I noticed this process running only once for about a half hour last week - never seen it before and never seen it again since. It was a process I noticed in the Activity Monitor called:
mDNSResponderHEL
I've hunted high and low for information on this. Does anyone know what it is? My son got on my iMac (again) and I'm noticing all sorts of strange things after he downloaded some software. As I said in another post, it's time to password protect my iMac - I've just done that now. No one else knows the password now so I won't have to worry about this kind of thing anymore - obviously, I have the newest and fastest iMac in the family and get "bugged" all the time to use it
I'd really like to know what this process is - I see mDNSResponder running all the time but never before have I seen mDNSResponderHEL.
Thanks,
Gerard

I may have written this down wrong - sorry about that. On one sticky note, I wrote down:
mDNSResponderHEL
And on another, I wrote down:
mDNSResponderECH
I don't know which one it was now! At any rate, is anyone familiar with either of these?
Thanks and sorry for the mix-up, just too much on the go these days...
Gerard

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