This is an application that communicates with an OPC server to receive/send data, messages and indications through specified custom and automation interfaces. This program can be used to read or write valueof the item or group of items with time stamp and quality information from local or remote OPC server. Received data can be stored in Microsoft Access database. Selected current data, messages or alarms are written in the file Logfile.txt. This is a fully functional program, limited only by the number of tags available. OPC Client 9.0 can be used in research laboratories and insitutions to test OPC communication.