I would assume that as they have "Internet TV" then they have access to the internet, and so you should also be able to connect and use the internet on your PC.
Their internet provider will be Telefoncia / Movistar.
There will be an ADSL modem / router in their place that you should be able to connect to.
AS for Internet TV, difficult to say.
If it is just Telefoncia / Movistar Internet TV service, then there are very few English channels on there - they will only have the rights to Spanish channels.
If they have a "android" box, then they will be using XBMC and the free UK TV feeds from filmon.com for their internet TV.
If they have a MAG250 box, then they will be paying a monthly subscription to a third party who is providing (probably without any permission from the actual channels), access tot he free UK TV channels.
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