Perhaps the most striking use of technology by the Party throughout the book is that of telescreens. These serve a double purpose. The private ones in people's living areas resemble televisions but they are used primarily to keep an eye on people, they work two ways, both giving out and receiving information. Perhaps the most sinister aspect of these is that they cannot be witched off; this is nonstop surveillance of people's private lives. There are also large telescreens in public spaces designed chiefly to spread propaganda. The Party also uses hidden microphones to spy on people's conversations.
As well as using technology for surveillance, the Party also uses it to control and change information; public records, documents, and most of all, historical records. These can be changed in an instant whenever the Party feels the need to do so. This is accomplished electronically. Another major use of technology is the use of sophisticated torture machines which help to manipulate people. To sum up, the Party uses technology both to control people and information.