I think he is not asking how its done but is it right to do that thing. Well when you are at work they are paying you and your time belongs to the office and the company has the right to know how you are using the company's paid time and resources. Nobody cares if you do little bit of browsing here and there. IT guys just dont go spying others computers as they have other things to do. They do it when the manager wants to know what an employee is doing. There is no privacy in the office if you are using the companys time and resources to do personal things. If the IT is spying on you then there is only one thing to think and that is if you are not doing your job properly then your manager is going to talk to you very soon