class for an OPC Group
A TdOPCGroup object is a aid for you to better handle your OPC items.
OPC groups are the way the OPC client tells the OPC server which OPC items it is interested in. They exist mainly for performance reasons. A OPC client have full freedom in how they create the OPC groups, and which items they put into them. You can have the same item in multiple groups; in fact you can even have the same item multiple times in the same group.