This paper describes the use of common sense knowledge to develop both interface and content of the applications taking into consideration people's cultural background. People can easily understand whole information presents in application when they are in a familiar and natural language. Because of this, it is important to consider people's culture, values and language during applications developing to allow them to use these applications in a familiar way to work or to interact with others people. To illustrate this possibility, it is presented here two applications with different objectives but both need to stimulate people to interact and to cooperate with each other. These two applications, called: Contexteller and FamilySense, use common sense knowledge to allow people feel themselves more interest to interact with computer and with others people through computer.