On 02/02/18 17:30, David wrote:
On Wed, 31 Jan 2018 21:03:51 +0000, Chris Green wrote:

Has anyone come across a video door entry system which uses an existing
television for the display? My M-I-L wants a door entry system which
allows her to see the visitor before unlocking the door but any 'extra'
display hardware really isn't practical.


yes and no. If you say use te TV as a sceeen to e,g., a linux computer
you can add a TV card to that and still have TV and then construct a
popup riggered by te doorbvell




--
The biggest threat to humanity comes from socialism, which has utterly
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survival, to indulging in navel gazing and faux moral investigations
into what the world ought to be, whilst we fail utterly to deal with
what it actually is.