Google didn't get me a 'general overview' - just specifics. like:
http://www.dvrmaster.com/category-35...alone-dvr.html
Any have pointers to webpages for info on practical differences between
using PC based CCTV vs webcams ? To use as security for ( remote ? )
monitoring of a house/store ? ( whether wired or wireless). Nothing
specific: I'm just looking to get educated to know the pros / cons of
either way.

Things like:
1.Why would someone choose one method over another ?
2.With CCTV you need to run coax cable ( limit x feet) and with webcams
you use 'xx type cable' and the limit is xx feet.
Is it mostly cable length the main reason to go with coax ?
3. If small house/condo does it matter ?
4. I can see that wireless would be easier to setup, but if not wired
cameras, easy for 'bad guys' to jam the signal ?

Recording styles -
1. Do they both take pictures periodically and save to disk ? Or is CCTV
constantly saving?
2. Recording everything vs recording just an alarm condition ( and how to
set it ?)
3. Is it legal to record audio with a store camera, or this that an
invasion of privacy ?
4. For the PC based stuff, how to setup " an alarm condition?" so that you
don't have to be watching the screen and do a screen capture to save the
picture? or accidentally overwrite it ?

I can see that 'older versions' recorded to VHS and needed a human to
replace the tape, but do non-vhs based systems ( writing to disk rather
than tape) overwrite themselves every x minutes ( variable setting) ? And
how much disk space to allow for x hours of video ? ( I can see that it
would depend on how many cameras/frames per second etc , but how to
determine how much to allow)

How about if NOT recording, but want to just have cameras to access your
home via internet when desired ... need remote PC online via high-speed
and a static IP for that ? again CCTV vs webcams - other than quality any
reason for one over another ?

Thanks for any links/pointers.