Computing resources of both hardware and software tends to be located at a certain place. Computing Grid that supports necessary application and required computing power offers the computing resources anywhere, if there is an Internet connection. A simple model of computing Grid composed of computing sites is designed with a new representative of the Grid, coordinator. It consolidates the computing sites in a manageable and transparent way. The Application client connects to the Grid by a Web browser. The access to a user data is allowed only after user authentication. The model is under implementation.