doorphone

Can anyone please give a brief guide line , about what cameras they use for the channel 4 reality show "Big Brother" both indoors and outdoor. How these above 50 cameras are connected to switching panel, what that switcher is called? and how the data is recorded on 24 hours basis. Like I have Sony cameras and metal-mickey, but I dont understand how they record so many cameras , which software they use , what device should be there to ensure their recording, is there any specific TV Production technique in this case?

Thank you for replying everyone, but is there any other forum where I should discuss this? , if we use 32 CCTV the normal ones, how many systems and what type of systems are required to capture their footage for 24 hours, if we are watching four cameras on one PC in split mode, is there any way of getting separate full size footage of each camera?