The Title Bar shows two important items: the model that is open (e.g., Sales.mdl) and the Workbench Variable (e.g., sales force productivity).
The Workbench Variable is any variable in the model that you have selected and for which you want more information, such as the dynamic behavior of that variable. The Workbench Variable is selected clicking on a variable or by using the Variable Selection Control in the Control Panel ("Control Panel" later in this Chapter).