In LabVIEW, you read data from or write data to a front panel object using its block diagram terminal. However, a front panel object has only one block diagram terminal, and your application might need to access the data in that terminal from more than one location.
Local and global variables pass information between locations in the application that you cannot connect with a wire. Use local variables to access front panel objects from more than one location in a single VI. Use global variables to access and pass data among several VIs.
Use a Feedback Node to store data from a previous VI or loop execution.
Refer to the labview\examples\general directory for examples of local and global variables.
Refer to the Feedback Node - Build Array VI in the labview\examples\general\structs.llb for examples of the Feedback Node.