1. A method for creating a graphical program which accesses data from/to one or more of a data source or a data target, wherein the method operates in a computer including a display screen and a user input device, the method comprising: displaying on the screen a data access node in the graphical program in response to user input; and configuring the data access node with location information of one or more of a data source or a data target; wherein, during execution of the graphical program, the data access node is operable to access data from/to the one or more of the data source or the data target.