This Recommendation gives an overview to the Q.1300-Series of Recommendations which define Telecommunication Applications for Switches and Computers (TASC). The main purpose of TASC is to allow applications running within the network user’s environment to integrate telecommunications services with computing facilities. This would typically allow business applications to use TASC to integrate the computer workstation and telephone at the user’s desktop. The overview contained in this Recommendation considers the requirements behind TASC and the key concepts leading to its definition. It also defines the vocabulary which is used by the other Recommendations in the TASC series.